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  * OBD_FAIL_CHECK
  53  */
  54 #include <obd_support.h>
  55
  56 #include "osd_internal.h"
  57
  58 /* ext_depth() */
  59 #include <ldiskfs/ldiskfs_extents.h>
  60 #include <ldiskfs/ldiskfs.h>
  61
  62 static inline bool osd_use_page_cache(struct osd_device *d)
  63 {
  64         /* do not use pagecache if write and read caching are disabled */
  65         if (d->od_writethrough_cache + d->od_read_cache == 0)
  66                 return false;
  67         /* use pagecache by default */
  68         return true;
  69 }
  70
  71 static int __osd_init_iobuf(struct osd_device *d, struct osd_iobuf *iobuf,
  72                             int rw, int line, int pages)
  73 {
  74         int blocks, i;
  75
  76         LASSERTF(iobuf->dr_elapsed_valid == 0,
  77                  "iobuf %p, reqs %d, rw %d, line %d\n", iobuf,
  78                  atomic_read(&iobuf->dr_numreqs), iobuf->dr_rw,
  79                  iobuf->dr_init_at);
  80         LASSERT(pages <= PTLRPC_MAX_BRW_PAGES);
  81
  82         init_waitqueue_head(&iobuf->dr_wait);
  83         atomic_set(&iobuf->dr_numreqs, 0);
  84         iobuf->dr_npages = 0;
  85         iobuf->dr_error = 0;
  86         iobuf->dr_dev = d;
  87         iobuf->dr_frags = 0;
  88         iobuf->dr_elapsed = ktime_set(0, 0);
  89         /* must be counted before, so assert */
  90         iobuf->dr_rw = rw;
  91         iobuf->dr_init_at = line;
  92
  93         blocks = pages * (PAGE_SIZE >> osd_sb(d)->s_blocksize_bits);
  94         if (iobuf->dr_bl_buf.lb_len >= blocks * sizeof(iobuf->dr_blocks[0])) {
  95                 LASSERT(iobuf->dr_pg_buf.lb_len >=
  96                         pages * sizeof(iobuf->dr_pages[0]));
  97                 return 0;
  98         }
  99
 100         /* start with 1MB for 4K blocks */
 101         i = 256;
 102         while (i <= PTLRPC_MAX_BRW_PAGES && i < pages)
 103                 i <<= 1;
 104
 105         CDEBUG(D_OTHER, "realloc %u for %u (%u) pages\n",
 106                (unsigned int)(pages * sizeof(iobuf->dr_pages[0])), i, pages);
 107         pages = i;
 108         blocks = pages * (PAGE_SIZE >> osd_sb(d)->s_blocksize_bits);
 109         iobuf->dr_max_pages = 0;
 110         CDEBUG(D_OTHER, "realloc %u for %u blocks\n",
 111                (unsigned int)(blocks * sizeof(iobuf->dr_blocks[0])), blocks);
 112
 113         lu_buf_realloc(&iobuf->dr_bl_buf, blocks * sizeof(iobuf->dr_blocks[0]));
 114         iobuf->dr_blocks = iobuf->dr_bl_buf.lb_buf;
 115         if (unlikely(iobuf->dr_blocks == NULL))
 116                 return -ENOMEM;
 117
 118         lu_buf_realloc(&iobuf->dr_pg_buf, pages * sizeof(iobuf->dr_pages[0]));
 119         iobuf->dr_pages = iobuf->dr_pg_buf.lb_buf;
 120         if (unlikely(iobuf->dr_pages == NULL))
 121                 return -ENOMEM;
 122
 123         lu_buf_realloc(&iobuf->dr_lnb_buf,
 124                        pages * sizeof(iobuf->dr_lnbs[0]));
 125         iobuf->dr_lnbs = iobuf->dr_lnb_buf.lb_buf;
 126         if (unlikely(iobuf->dr_lnbs == NULL))
 127                 return -ENOMEM;
 128
 129         iobuf->dr_max_pages = pages;
 130
 131         return 0;
 132 }
 133 #define osd_init_iobuf(dev, iobuf, rw, pages) \
 134         __osd_init_iobuf(dev, iobuf, rw, __LINE__, pages)
 135
 136 static void osd_iobuf_add_page(struct osd_iobuf *iobuf,
 137                                struct niobuf_local *lnb)
 138 {
 139         LASSERT(iobuf->dr_npages < iobuf->dr_max_pages);
 140         iobuf->dr_pages[iobuf->dr_npages] = lnb->lnb_page;
 141         iobuf->dr_lnbs[iobuf->dr_npages] = lnb;
 142         iobuf->dr_npages++;
 143 }
 144
 145 void osd_fini_iobuf(struct osd_device *d, struct osd_iobuf *iobuf)
 146 {
 147         int rw = iobuf->dr_rw;
 148
 149         if (iobuf->dr_elapsed_valid) {
 150                 struct brw_stats *h = &d->od_brw_stats;
 151
 152                 iobuf->dr_elapsed_valid = 0;
 153                 LASSERT(iobuf->dr_dev == d);
 154                 LASSERT(iobuf->dr_frags > 0);
 155                 lprocfs_oh_tally_pcpu(&h->bs_hist[BRW_R_DIO_FRAGS+rw],
 156                                       iobuf->dr_frags);
 157                 lprocfs_oh_tally_log2_pcpu(&h->bs_hist[BRW_R_IO_TIME+rw],
 158                                            ktime_to_ms(iobuf->dr_elapsed));
 159         }
 160 }
 161
 162 #ifdef HAVE_BIO_ENDIO_USES_ONE_ARG
 163 static void dio_complete_routine(struct bio *bio)
 164 {
 165         int error = blk_status_to_errno(bio->bi_status);
 166 #else
 167 static void dio_complete_routine(struct bio *bio, int error)
 168 {
 169 #endif
 170         struct osd_iobuf *iobuf = bio->bi_private;
 171         struct bio_vec *bvl;
 172
 173         /* CAVEAT EMPTOR: possibly in IRQ context
 174          * DO NOT record procfs stats here!!!
 175          */
 176
 177         if (unlikely(iobuf == NULL)) {
 178                 CERROR("***** bio->bi_private is NULL! Dump the bio contents to the console. Please report this to <https://jira.whamcloud.com/>, and probably have to reboot this node.\n");
 179                 CERROR("bi_next: %p, bi_flags: %lx, " __stringify(bi_opf)
 180                        ": %x, bi_vcnt: %d, bi_idx: %d, bi->size: %d, bi_end_io: %p, bi_cnt: %d, bi_private: %p\n",
 181                        bio->bi_next, (unsigned long)bio->bi_flags,
 182                        (unsigned int)bio->bi_opf, bio->bi_vcnt, bio_idx(bio),
 183                        bio_sectors(bio) << 9, bio->bi_end_io,
 184                        atomic_read(&bio->__bi_cnt),
 185                        bio->bi_private);
 186                 return;
 187         }
 188
 189         /* the check is outside of the cycle for performance reason -bzzz */
 190         if (!bio_data_dir(bio)) {
 191                 DECLARE_BVEC_ITER_ALL(iter_all);
 192
 193                 bio_for_each_segment_all(bvl, bio, iter_all) {
 194                         if (likely(error == 0))
 195                                 SetPageUptodate(bvl_to_page(bvl));
 196                         LASSERT(PageLocked(bvl_to_page(bvl)));
 197                 }
 198                 atomic_dec(&iobuf->dr_dev->od_r_in_flight);
 199         } else {
 200                 atomic_dec(&iobuf->dr_dev->od_w_in_flight);
 201         }
 202
 203         /* any real error is good enough -bzzz */
 204         if (error != 0 && iobuf->dr_error == 0)
 205                 iobuf->dr_error = error;
 206
 207         /*
 208          * set dr_elapsed before dr_numreqs turns to 0, otherwise
 209          * it's possible that service thread will see dr_numreqs
 210          * is zero, but dr_elapsed is not set yet, leading to lost
 211          * data in this processing and an assertion in a subsequent
 212          * call to OSD.
 213          */
 214         if (atomic_read(&iobuf->dr_numreqs) == 1) {
 215                 ktime_t now = ktime_get();
 216
 217                 iobuf->dr_elapsed = ktime_sub(now, iobuf->dr_start_time);
 218                 iobuf->dr_elapsed_valid = 1;
 219         }
 220         if (atomic_dec_and_test(&iobuf->dr_numreqs))
 221                 wake_up(&iobuf->dr_wait);
 222
 223         /* Completed bios used to be chained off iobuf->dr_bios and freed in
 224          * filter_clear_dreq().  It was then possible to exhaust the biovec-256
 225          * mempool when serious on-disk fragmentation was encountered,
 226          * deadlocking the OST.  The bios are now released as soon as complete
 227          * so the pool cannot be exhausted while IOs are competing. b=10076
 228          */
 229         bio_put(bio);
 230 }
 231
 232 static void record_start_io(struct osd_iobuf *iobuf, int size)
 233 {
 234         struct osd_device *osd = iobuf->dr_dev;
 235         struct brw_stats *h = &osd->od_brw_stats;
 236
 237         iobuf->dr_frags++;
 238         atomic_inc(&iobuf->dr_numreqs);
 239
 240         if (iobuf->dr_rw == 0) {
 241                 atomic_inc(&osd->od_r_in_flight);
 242                 lprocfs_oh_tally_pcpu(&h->bs_hist[BRW_R_RPC_HIST],
 243                                  atomic_read(&osd->od_r_in_flight));
 244                 lprocfs_oh_tally_log2_pcpu(&h->bs_hist[BRW_R_DISK_IOSIZE],
 245                                            size);
 246         } else if (iobuf->dr_rw == 1) {
 247                 atomic_inc(&osd->od_w_in_flight);
 248                 lprocfs_oh_tally_pcpu(&h->bs_hist[BRW_W_RPC_HIST],
 249                                  atomic_read(&osd->od_w_in_flight));
 250                 lprocfs_oh_tally_log2_pcpu(&h->bs_hist[BRW_W_DISK_IOSIZE],
 251                                            size);
 252         } else {
 253                 LBUG();
 254         }
 255 }
 256
 257 static void osd_submit_bio(int rw, struct bio *bio)
 258 {
 259         LASSERTF(rw == 0 || rw == 1, "%x\n", rw);
 260 #ifdef HAVE_SUBMIT_BIO_2ARGS
 261         submit_bio(rw ? WRITE : READ, bio);
 262 #else
 263         bio->bi_opf |= rw;
 264         submit_bio(bio);
 265 #endif
 266 }
 267
 268 static int can_be_merged(struct bio *bio, sector_t sector)
 269 {
 270         if (bio == NULL)
 271                 return 0;
 272
 273         return bio_end_sector(bio) == sector ? 1 : 0;
 274 }
 275
 276 #if IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY)
 277 /*
 278  * This function will change the data written, thus it should only be
 279  * used when checking data integrity feature
 280  */
 281 static void bio_integrity_fault_inject(struct bio *bio)
 282 {
 283         struct bio_vec *bvec;
 284         DECLARE_BVEC_ITER_ALL(iter_all);
 285         void *kaddr;
 286         char *addr;
 287
 288         bio_for_each_segment_all(bvec, bio, iter_all) {
 289                 struct page *page = bvec->bv_page;
 290
 291                 kaddr = kmap(page);
 292                 addr = kaddr;
 293                 *addr = ~(*addr);
 294                 kunmap(page);
 295                 break;
 296         }
 297 }
 298
 299 static int bio_dif_compare(__u16 *expected_guard_buf, void *bio_prot_buf,
 300                            unsigned int sectors, int tuple_size)
 301 {
 302         __u16 *expected_guard;
 303         __u16 *bio_guard;
 304         int i;
 305
 306         expected_guard = expected_guard_buf;
 307         for (i = 0; i < sectors; i++) {
 308                 bio_guard = (__u16 *)bio_prot_buf;
 309                 if (*bio_guard != *expected_guard) {
 310                         CERROR(
 311                                "unexpected guard tags on sector %d expected guard %u, bio guard %u, sectors %u, tuple size %d\n",
 312                                i, *expected_guard, *bio_guard, sectors,
 313                                tuple_size);
 314                         return -EIO;
 315                 }
 316                 expected_guard++;
 317                 bio_prot_buf += tuple_size;
 318         }
 319         return 0;
 320 }
 321
 322 static int osd_bio_integrity_compare(struct bio *bio, struct block_device *bdev,
 323                                      struct osd_iobuf *iobuf, int index)
 324 {
 325         struct blk_integrity *bi = bdev_get_integrity(bdev);
 326         struct bio_integrity_payload *bip = bio->bi_integrity;
 327         struct niobuf_local *lnb = NULL;
 328         unsigned short sector_size = blk_integrity_interval(bi);
 329         void *bio_prot_buf = page_address(bip->bip_vec->bv_page) +
 330                 bip->bip_vec->bv_offset;
 331         struct bio_vec *bv;
 332         sector_t sector = bio_start_sector(bio);
 333         unsigned int i, sectors, total;
 334         DECLARE_BVEC_ITER_ALL(iter_all);
 335         __u16 *expected_guard;
 336         int rc;
 337
 338         total = 0;
 339         bio_for_each_segment_all(bv, bio, iter_all) {
 340                 for (i = index; i < iobuf->dr_npages; i++) {
 341                         if (iobuf->dr_pages[i] == bv->bv_page) {
 342                                 lnb = iobuf->dr_lnbs[i];
 343                                 break;
 344                         }
 345                 }
 346                 if (!lnb)
 347                         continue;
 348                 expected_guard = lnb->lnb_guards;
 349                 sectors = bv->bv_len / sector_size;
 350                 if (lnb->lnb_guard_rpc) {
 351                         rc = bio_dif_compare(expected_guard, bio_prot_buf,
 352                                              sectors, bi->tuple_size);
 353                         if (rc)
 354                                 return rc;
 355                 }
 356
 357                 sector += sectors;
 358                 bio_prot_buf += sectors * bi->tuple_size;
 359                 total += sectors * bi->tuple_size;
 360                 LASSERT(total <= bip_size(bio->bi_integrity));
 361                 index++;
 362                 lnb = NULL;
 363         }
 364         return 0;
 365 }
 366
 367 static int osd_bio_integrity_handle(struct osd_device *osd, struct bio *bio,
 368                                     struct osd_iobuf *iobuf,
 369                                     int start_page_idx, bool fault_inject,
 370                                     bool integrity_enabled)
 371 {
 372         struct super_block *sb = osd_sb(osd);
 373         integrity_gen_fn *generate_fn = NULL;
 374         integrity_vrfy_fn *verify_fn = NULL;
 375         int rc;
 376
 377         ENTRY;
 378
 379         if (!integrity_enabled)
 380                 RETURN(0);
 381
 382         rc = osd_get_integrity_profile(osd, &generate_fn, &verify_fn);
 383         if (rc)
 384                 RETURN(rc);
 385
 386         rc = bio_integrity_prep_fn(bio, generate_fn, verify_fn);
 387         if (rc)
 388                 RETURN(rc);
 389
 390         /* Verify and inject fault only when writing */
 391         if (iobuf->dr_rw == 1) {
 392                 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_OST_INTEGRITY_CMP))) {
 393                         rc = osd_bio_integrity_compare(bio, sb->s_bdev, iobuf,
 394                                                        start_page_idx);
 395                         if (rc)
 396                                 RETURN(rc);
 397                 }
 398
 399                 if (unlikely(fault_inject))
 400                         bio_integrity_fault_inject(bio);
 401         }
 402
 403         RETURN(0);
 404 }
 405
 406 #ifdef HAVE_BIO_INTEGRITY_PREP_FN
 407 #  ifdef HAVE_BIO_ENDIO_USES_ONE_ARG
 408 static void dio_integrity_complete_routine(struct bio *bio)
 409 #  else
 410 static void dio_integrity_complete_routine(struct bio *bio, int error)
 411 #  endif
 412 {
 413         struct osd_bio_private *bio_private = bio->bi_private;
 414
 415         bio->bi_private = bio_private->obp_iobuf;
 416         osd_dio_complete_routine(bio, error);
 417
 418         OBD_FREE_PTR(bio_private);
 419 }
 420 #endif /* HAVE_BIO_INTEGRITY_PREP_FN */
 421 #else  /* !CONFIG_BLK_DEV_INTEGRITY */
 422 #define osd_bio_integrity_handle(osd, bio, iobuf, start_page_idx, \
 423                                  fault_inject, integrity_enabled) 0
 424 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 425
 426 static int osd_bio_init(struct bio *bio, struct osd_iobuf *iobuf,
 427                         bool integrity_enabled, int start_page_idx,
 428                         struct osd_bio_private **pprivate)
 429 {
 430         ENTRY;
 431
 432         *pprivate = NULL;
 433
 434 #ifdef HAVE_BIO_INTEGRITY_PREP_FN
 435         if (integrity_enabled) {
 436                 struct osd_bio_private *bio_private = NULL;
 437
 438                 OBD_ALLOC_GFP(bio_private, sizeof(*bio_private), GFP_NOIO);
 439                 if (bio_private == NULL)
 440                         RETURN(-ENOMEM);
 441                 bio->bi_end_io = dio_integrity_complete_routine;
 442                 bio->bi_private = bio_private;
 443                 bio_private->obp_start_page_idx = start_page_idx;
 444                 bio_private->obp_iobuf = iobuf;
 445                 *pprivate = bio_private;
 446         } else
 447 #endif
 448         {
 449                 bio->bi_end_io = dio_complete_routine;
 450                 bio->bi_private = iobuf;
 451         }
 452
 453         RETURN(0);
 454 }
 455
 456 static void osd_mark_page_io_done(struct osd_iobuf *iobuf,
 457                                   struct inode *inode,
 458                                   sector_t start_blocks,
 459                                   sector_t count)
 460 {
 461         struct niobuf_local *lnb;
 462         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 463         pgoff_t pg_start, pg_end;
 464
 465         pg_start = start_blocks / blocks_per_page;
 466         if (start_blocks % blocks_per_page)
 467                 pg_start++;
 468         if (count >= blocks_per_page)
 469                 pg_end = (start_blocks + count -
 470                           blocks_per_page) / blocks_per_page;
 471         else
 472                 return; /* nothing to mark */
 473         for ( ; pg_start <= pg_end; pg_start++) {
 474                 lnb = iobuf->dr_lnbs[pg_start];
 475                 lnb->lnb_flags |= OBD_BRW_DONE;
 476         }
 477 }
 478
 479 static int osd_do_bio(struct osd_device *osd, struct inode *inode,
 480                       struct osd_iobuf *iobuf, sector_t start_blocks,
 481                       sector_t count)
 482 {
 483         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 484         struct page **pages = iobuf->dr_pages;
 485         int npages = iobuf->dr_npages;
 486         sector_t *blocks = iobuf->dr_blocks;
 487         struct super_block *sb = inode->i_sb;
 488         int sector_bits = sb->s_blocksize_bits - 9;
 489         unsigned int blocksize = sb->s_blocksize;
 490         struct block_device *bdev = sb->s_bdev;
 491         struct osd_bio_private *bio_private = NULL;
 492         struct bio *bio = NULL;
 493         int bio_start_page_idx;
 494         struct page *page;
 495         unsigned int page_offset;
 496         sector_t sector;
 497         int nblocks;
 498         int block_idx, block_idx_end;
 499         int page_idx, page_idx_start;
 500         int i;
 501         int rc = 0;
 502         bool fault_inject;
 503         bool integrity_enabled;
 504         struct blk_plug plug;
 505         int blocks_left_page;
 506
 507         ENTRY;
 508
 509         fault_inject = OBD_FAIL_CHECK(OBD_FAIL_OST_INTEGRITY_FAULT);
 510         LASSERT(iobuf->dr_npages == npages);
 511
 512         integrity_enabled = bdev_integrity_enabled(bdev, iobuf->dr_rw);
 513
 514         osd_brw_stats_update(osd, iobuf);
 515         iobuf->dr_start_time = ktime_get();
 516
 517         if (!count)
 518                 count = npages * blocks_per_page;
 519         block_idx_end = start_blocks + count;
 520
 521         blk_start_plug(&plug);
 522
 523         page_idx_start = start_blocks / blocks_per_page;
 524         for (page_idx = page_idx_start, block_idx = start_blocks;
 525              block_idx < block_idx_end; page_idx++,
 526              block_idx += blocks_left_page) {
 527                 /* For cases where the filesystems blocksize is not the
 528                  * same as PAGE_SIZE (e.g. ARM with PAGE_SIZE=64KB and
 529                  * blocksize=4KB), there will be multiple blocks to
 530                  * read/write per page. Also, the start and end block may
 531                  * not be aligned to the start and end of the page, so the
 532                  * first page may skip some blocks at the start ("i != 0",
 533                  * "blocks_left_page" is reduced), and the last page may
 534                  * skip some blocks at the end (limited by "count").
 535                  */
 536                 page = pages[page_idx];
 537                 LASSERT(page_idx < iobuf->dr_npages);
 538
 539                 i = block_idx % blocks_per_page;
 540                 blocks_left_page = blocks_per_page - i;
 541                 if (block_idx + blocks_left_page > block_idx_end)
 542                         blocks_left_page = block_idx_end - block_idx;
 543                 page_offset = i * blocksize;
 544                 for (i = 0; i < blocks_left_page;
 545                      i += nblocks, page_offset += blocksize * nblocks) {
 546                         nblocks = 1;
 547
 548                         if (blocks[block_idx + i] == 0) {  /* hole */
 549                                 LASSERTF(iobuf->dr_rw == 0,
 550                                          "page_idx %u, block_idx %u, i %u,"
 551                                          "start_blocks: %llu, count: %llu, npages: %d\n",
 552                                          page_idx, block_idx, i,
 553                                          (unsigned long long)start_blocks,
 554                                          (unsigned long long)count, npages);
 555                                 memset(kmap(page) + page_offset, 0, blocksize);
 556                                 kunmap(page);
 557                                 continue;
 558                         }
 559
 560                         sector = (sector_t)blocks[block_idx + i] << sector_bits;
 561
 562                         /* Additional contiguous file blocks? */
 563                         while (i + nblocks < blocks_left_page &&
 564                                (sector + (nblocks << sector_bits)) ==
 565                                ((sector_t)blocks[block_idx + i + nblocks] <<
 566                                  sector_bits))
 567                                 nblocks++;
 568
 569                         if (bio && can_be_merged(bio, sector) &&
 570                             bio_add_page(bio, page, blocksize * nblocks,
 571                                          page_offset) != 0)
 572                                 continue;       /* added this frag OK */
 573
 574                         if (bio != NULL) {
 575                                 struct request_queue *q = bio_get_queue(bio);
 576                                 unsigned int bi_size = bio_sectors(bio) << 9;
 577
 578                                 /* Dang! I have to fragment this I/O */
 579                                 CDEBUG(D_INODE,
 580                                        "bio++ sz %d vcnt %d(%d) sectors %d(%d) psg %d(%d)\n",
 581                                        bi_size, bio->bi_vcnt, bio->bi_max_vecs,
 582                                        bio_sectors(bio),
 583                                        queue_max_sectors(q),
 584                                        osd_bio_nr_segs(bio),
 585                                        queue_max_segments(q));
 586                                 rc = osd_bio_integrity_handle(osd, bio,
 587                                         iobuf, bio_start_page_idx,
 588                                         fault_inject, integrity_enabled);
 589                                 if (rc) {
 590                                         bio_put(bio);
 591                                         goto out;
 592                                 }
 593
 594                                 record_start_io(iobuf, bi_size);
 595                                 osd_submit_bio(iobuf->dr_rw, bio);
 596                         }
 597
 598                         bio_start_page_idx = page_idx;
 599                         /* allocate new bio */
 600                         bio = bio_alloc(GFP_NOIO, min(BIO_MAX_PAGES,
 601                                         (block_idx_end - block_idx +
 602                                          blocks_left_page - 1)));
 603                         if (bio == NULL) {
 604                                 CERROR("Can't allocate bio %u pages\n",
 605                                        block_idx_end - block_idx +
 606                                        blocks_left_page - 1);
 607                                 rc = -ENOMEM;
 608                                 goto out;
 609                         }
 610
 611                         bio_set_dev(bio, bdev);
 612                         bio_set_sector(bio, sector);
 613                         bio->bi_opf = iobuf->dr_rw ? WRITE : READ;
 614                         rc = osd_bio_init(bio, iobuf, integrity_enabled,
 615                                           bio_start_page_idx, &bio_private);
 616                         if (rc) {
 617                                 bio_put(bio);
 618                                 goto out;
 619                         }
 620
 621                         rc = bio_add_page(bio, page,
 622                                           blocksize * nblocks, page_offset);
 623                         LASSERT(rc != 0);
 624                 }
 625         }
 626
 627         if (bio != NULL) {
 628                 rc = osd_bio_integrity_handle(osd, bio, iobuf,
 629                                               bio_start_page_idx,
 630                                               fault_inject,
 631                                               integrity_enabled);
 632                 if (rc) {
 633                         bio_put(bio);
 634                         goto out;
 635                 }
 636
 637                 record_start_io(iobuf, bio_sectors(bio) << 9);
 638                 osd_submit_bio(iobuf->dr_rw, bio);
 639                 rc = 0;
 640         }
 641
 642 out:
 643         blk_finish_plug(&plug);
 644
 645         /* in order to achieve better IO throughput, we don't wait for writes
 646          * completion here. instead we proceed with transaction commit in
 647          * parallel and wait for IO completion once transaction is stopped
 648          * see osd_trans_stop() for more details -bzzz
 649          */
 650         if (iobuf->dr_rw == 0 || fault_inject) {
 651                 wait_event(iobuf->dr_wait,
 652                            atomic_read(&iobuf->dr_numreqs) == 0);
 653                 osd_fini_iobuf(osd, iobuf);
 654         }
 655
 656         if (rc == 0) {
 657                 rc = iobuf->dr_error;
 658         } else {
 659                 if (bio_private)
 660                         OBD_FREE_PTR(bio_private);
 661         }
 662
 663         /* Write only now */
 664         if (rc == 0 && iobuf->dr_rw)
 665                 osd_mark_page_io_done(iobuf, inode,
 666                                       start_blocks, count);
 667
 668         RETURN(rc);
 669 }
 670
 671 static int osd_map_remote_to_local(loff_t offset, ssize_t len, int *nrpages,
 672                                    struct niobuf_local *lnb, int maxlnb)
 673 {
 674         int rc = 0;
 675         ENTRY;
 676
 677         *nrpages = 0;
 678
 679         while (len > 0) {
 680                 int poff = offset & (PAGE_SIZE - 1);
 681                 int plen = PAGE_SIZE - poff;
 682
 683                 if (*nrpages >= maxlnb) {
 684                         rc = -EOVERFLOW;
 685                         break;
 686                 }
 687
 688                 if (plen > len)
 689                         plen = len;
 690                 lnb->lnb_file_offset = offset;
 691                 lnb->lnb_page_offset = poff;
 692                 lnb->lnb_len = plen;
 693                 /* lnb->lnb_flags = rnb->rnb_flags; */
 694                 lnb->lnb_flags = 0;
 695                 lnb->lnb_page = NULL;
 696                 lnb->lnb_rc = 0;
 697                 lnb->lnb_guard_rpc = 0;
 698                 lnb->lnb_guard_disk = 0;
 699                 lnb->lnb_locked = 0;
 700
 701                 LASSERTF(plen <= len, "plen %u, len %lld\n", plen,
 702                          (long long) len);
 703                 offset += plen;
 704                 len -= plen;
 705                 lnb++;
 706                 (*nrpages)++;
 707         }
 708
 709         RETURN(rc);
 710 }
 711
 712 static struct page *osd_get_page(const struct lu_env *env, struct dt_object *dt,
 713                                  loff_t offset, gfp_t gfp_mask, bool cache)
 714 {
 715         struct osd_thread_info *oti = osd_oti_get(env);
 716         struct inode *inode = osd_dt_obj(dt)->oo_inode;
 717         struct osd_device *d = osd_obj2dev(osd_dt_obj(dt));
 718         struct page *page;
 719         int cur;
 720
 721         LASSERT(inode);
 722
 723         if (cache) {
 724                 page = find_or_create_page(inode->i_mapping,
 725                                            offset >> PAGE_SHIFT, gfp_mask);
 726
 727                 if (likely(page)) {
 728                         LASSERT(!PagePrivate2(page));
 729                         wait_on_page_writeback(page);
 730                 } else {
 731                         lprocfs_counter_add(d->od_stats, LPROC_OSD_NO_PAGE, 1);
 732                 }
 733
 734                 return page;
 735         }
 736
 737         if (inode->i_mapping->nrpages) {
 738                 /* consult with pagecache, but do not create new pages */
 739                 /* this is normally used once */
 740                 page = find_lock_page(inode->i_mapping, offset >> PAGE_SHIFT);
 741                 if (page) {
 742                         wait_on_page_writeback(page);
 743                         return page;
 744                 }
 745         }
 746
 747         LASSERT(oti->oti_dio_pages);
 748         cur = oti->oti_dio_pages_used;
 749         page = oti->oti_dio_pages[cur];
 750
 751         if (unlikely(!page)) {
 752                 LASSERT(cur < PTLRPC_MAX_BRW_PAGES);
 753                 page = alloc_page(gfp_mask);
 754                 if (!page)
 755                         return NULL;
 756                 oti->oti_dio_pages[cur] = page;
 757                 SetPagePrivate2(page);
 758                 lock_page(page);
 759         }
 760
 761         ClearPageUptodate(page);
 762         page->index = offset >> PAGE_SHIFT;
 763         oti->oti_dio_pages_used++;
 764
 765         return page;
 766 }
 767
 768 /*
 769  * there are following "locks":
 770  * journal_start
 771  * i_mutex
 772  * page lock
 773  *
 774  * osd write path:
 775  *  - lock page(s)
 776  *  - journal_start
 777  *  - truncate_sem
 778  *
 779  * ext4 vmtruncate:
 780  *  - lock pages, unlock
 781  *  - journal_start
 782  *  - lock partial page
 783  *  - i_data_sem
 784  *
 785  */
 786
 787 /**
 788  * Unlock and release pages loaded by osd_bufs_get()
 789  *
 790  * Unlock \a npages pages from \a lnb and drop the refcount on them.
 791  *
 792  * \param env           thread execution environment
 793  * \param dt            dt object undergoing IO (OSD object + methods)
 794  * \param lnb           array of pages undergoing IO
 795  * \param npages        number of pages in \a lnb
 796  *
 797  * \retval 0            always
 798  */
 799 static int osd_bufs_put(const struct lu_env *env, struct dt_object *dt,
 800                         struct niobuf_local *lnb, int npages)
 801 {
 802         struct osd_thread_info *oti = osd_oti_get(env);
 803         struct pagevec pvec;
 804         int i;
 805
 806         ll_pagevec_init(&pvec, 0);
 807
 808         for (i = 0; i < npages; i++) {
 809                 struct page *page = lnb[i].lnb_page;
 810
 811                 if (page == NULL)
 812                         continue;
 813
 814                 /* if the page isn't cached, then reset uptodate
 815                  * to prevent reuse
 816                  */
 817                 if (PagePrivate2(page)) {
 818                         oti->oti_dio_pages_used--;
 819                 } else {
 820                         if (lnb[i].lnb_locked)
 821                                 unlock_page(page);
 822                         if (pagevec_add(&pvec, page) == 0)
 823                                 pagevec_release(&pvec);
 824                 }
 825
 826                 lnb[i].lnb_page = NULL;
 827         }
 828
 829         LASSERTF(oti->oti_dio_pages_used == 0, "%d\n", oti->oti_dio_pages_used);
 830
 831         /* Release any partial pagevec */
 832         pagevec_release(&pvec);
 833
 834         RETURN(0);
 835 }
 836
 837 /**
 838  * Load and lock pages undergoing IO
 839  *
 840  * Pages as described in the \a lnb array are fetched (from disk or cache)
 841  * and locked for IO by the caller.
 842  *
 843  * DLM locking protects us from write and truncate competing for same region,
 844  * but partial-page truncate can leave dirty pages in the cache for ldiskfs.
 845  * It's possible the writeout on a such a page is in progress when we access
 846  * it. It's also possible that during this writeout we put new (partial) data
 847  * into the page, but won't be able to proceed in filter_commitrw_write().
 848  * Therefore, just wait for writeout completion as it should be rare enough.
 849  *
 850  * \param env           thread execution environment
 851  * \param dt            dt object undergoing IO (OSD object + methods)
 852  * \param pos           byte offset of IO start
 853  * \param len           number of bytes of IO
 854  * \param lnb           array of extents undergoing IO
 855  * \param rw            read or write operation, and other flags
 856  * \param capa          capabilities
 857  *
 858  * \retval pages        (zero or more) loaded successfully
 859  * \retval -ENOMEM      on memory/page allocation error
 860  */
 861 static int osd_bufs_get(const struct lu_env *env, struct dt_object *dt,
 862                         loff_t pos, ssize_t len, struct niobuf_local *lnb,
 863                         int maxlnb, enum dt_bufs_type rw)
 864 {
 865         struct osd_thread_info *oti = osd_oti_get(env);
 866         struct osd_object *obj = osd_dt_obj(dt);
 867         struct osd_device *osd   = osd_obj2dev(obj);
 868         int npages, i, iosize, rc = 0;
 869         bool cache, write;
 870         loff_t fsize;
 871         gfp_t gfp_mask;
 872
 873         LASSERT(obj->oo_inode);
 874
 875         rc = osd_map_remote_to_local(pos, len, &npages, lnb, maxlnb);
 876         if (rc)
 877                 RETURN(rc);
 878
 879         write = rw & DT_BUFS_TYPE_WRITE;
 880
 881         fsize = lnb[npages - 1].lnb_file_offset + lnb[npages - 1].lnb_len;
 882         iosize = fsize - lnb[0].lnb_file_offset;
 883         fsize = max(fsize, i_size_read(obj->oo_inode));
 884
 885         cache = rw & DT_BUFS_TYPE_READAHEAD;
 886         if (cache)
 887                 goto bypass_checks;
 888
 889         cache = osd_use_page_cache(osd);
 890         while (cache) {
 891                 if (write) {
 892                         if (!osd->od_writethrough_cache) {
 893                                 cache = false;
 894                                 break;
 895                         }
 896                         if (iosize > osd->od_writethrough_max_iosize) {
 897                                 cache = false;
 898                                 break;
 899                         }
 900                 } else {
 901                         if (!osd->od_read_cache) {
 902                                 cache = false;
 903                                 break;
 904                         }
 905                         if (iosize > osd->od_readcache_max_iosize) {
 906                                 cache = false;
 907                                 break;
 908                         }
 909                 }
 910                 /* don't use cache on large files */
 911                 if (osd->od_readcache_max_filesize &&
 912                     fsize > osd->od_readcache_max_filesize)
 913                         cache = false;
 914                 break;
 915         }
 916
 917 bypass_checks:
 918         if (!cache && unlikely(!oti->oti_dio_pages)) {
 919                 OBD_ALLOC_PTR_ARRAY_LARGE(oti->oti_dio_pages,
 920                                           PTLRPC_MAX_BRW_PAGES);
 921                 if (!oti->oti_dio_pages)
 922                         return -ENOMEM;
 923         }
 924
 925         /* this could also try less hard for DT_BUFS_TYPE_READAHEAD pages */
 926         gfp_mask = rw & DT_BUFS_TYPE_LOCAL ? (GFP_NOFS | __GFP_HIGHMEM) :
 927                                              GFP_HIGHUSER;
 928         for (i = 0; i < npages; i++, lnb++) {
 929                 lnb->lnb_page = osd_get_page(env, dt, lnb->lnb_file_offset,
 930                                              gfp_mask, cache);
 931                 if (lnb->lnb_page == NULL)
 932                         GOTO(cleanup, rc = -ENOMEM);
 933
 934                 lnb->lnb_locked = 1;
 935                 if (cache)
 936                         mark_page_accessed(lnb->lnb_page);
 937         }
 938
 939 #if 0
 940         /* XXX: this version doesn't invalidate cached pages, but use them */
 941         if (!cache && write && obj->oo_inode->i_mapping->nrpages) {
 942                 /* do not allow data aliasing, invalidate pagecache */
 943                 /* XXX: can be quite expensive in mixed case */
 944                 invalidate_mapping_pages(obj->oo_inode->i_mapping,
 945                                 lnb[0].lnb_file_offset >> PAGE_SHIFT,
 946                                 lnb[npages - 1].lnb_file_offset >> PAGE_SHIFT);
 947         }
 948 #endif
 949
 950         RETURN(i);
 951
 952 cleanup:
 953         if (i > 0)
 954                 osd_bufs_put(env, dt, lnb - i, i);
 955         return rc;
 956 }
 957 /* Borrow @ext4_chunk_trans_blocks */
 958 static int osd_chunk_trans_blocks(struct inode *inode, int nrblocks)
 959 {
 960         ldiskfs_group_t groups;
 961         int gdpblocks;
 962         int idxblocks;
 963         int depth;
 964         int ret;
 965
 966         depth = ext_depth(inode);
 967         idxblocks = depth * 2;
 968
 969         /*
 970          * Now let's see how many group bitmaps and group descriptors need
 971          * to account.
 972          */
 973         groups = idxblocks + 1;
 974         gdpblocks = groups;
 975         if (groups > LDISKFS_SB(inode->i_sb)->s_groups_count)
 976                 groups = LDISKFS_SB(inode->i_sb)->s_groups_count;
 977         if (gdpblocks > LDISKFS_SB(inode->i_sb)->s_gdb_count)
 978                 gdpblocks = LDISKFS_SB(inode->i_sb)->s_gdb_count;
 979
 980         /* bitmaps and block group descriptor blocks */
 981         ret = idxblocks + groups + gdpblocks;
 982
 983         /* Blocks for super block, inode, quota and xattr blocks */
 984         ret += LDISKFS_META_TRANS_BLOCKS(inode->i_sb);
 985
 986         return ret;
 987 }
 988
 989 #ifdef HAVE_LDISKFS_JOURNAL_ENSURE_CREDITS
 990 static int osd_extend_restart_trans(handle_t *handle, int needed,
 991                                     struct inode *inode)
 992 {
 993         int rc;
 994
 995         rc = ldiskfs_journal_ensure_credits(handle, needed,
 996                 ldiskfs_trans_default_revoke_credits(inode->i_sb));
 997         /* this means journal has been restarted */
 998         if (rc > 0)
 999                 rc = 0;
1000
1001         return rc;
1002 }
1003 #else
1004 static int osd_extend_restart_trans(handle_t *handle, int needed,
1005                                     struct inode *inode)
1006 {
1007         int rc;
1008
1009         if (ldiskfs_handle_has_enough_credits(handle, needed))
1010                 return 0;
1011         rc = ldiskfs_journal_extend(handle,
1012                                 needed - handle->h_buffer_credits);
1013         if (rc <= 0)
1014                 return rc;
1015
1016         return ldiskfs_journal_restart(handle, needed);
1017 }
1018 #endif /* HAVE_LDISKFS_JOURNAL_ENSURE_CREDITS */
1019
1020 static int osd_ldiskfs_map_write(struct inode *inode, struct osd_iobuf *iobuf,
1021                                  struct osd_device *osd, sector_t start_blocks,
1022                                  sector_t count, loff_t *disk_size,
1023                                  __u64 user_size)
1024 {
1025         /* if file has grown, take user_size into account */
1026         if (user_size && *disk_size > user_size)
1027                 *disk_size = user_size;
1028
1029         spin_lock(&inode->i_lock);
1030         if (*disk_size > i_size_read(inode)) {
1031                 i_size_write(inode, *disk_size);
1032                 LDISKFS_I(inode)->i_disksize = *disk_size;
1033                 spin_unlock(&inode->i_lock);
1034                 osd_dirty_inode(inode, I_DIRTY_DATASYNC);
1035         } else {
1036                 spin_unlock(&inode->i_lock);
1037         }
1038
1039         /*
1040          * We don't do stats here as in read path because
1041          * write is async: we'll do this in osd_put_bufs()
1042          */
1043         return osd_do_bio(osd, inode, iobuf, start_blocks, count);
1044 }
1045
1046 static unsigned int osd_extent_bytes(const struct osd_device *o)
1047 {
1048         unsigned int *extent_bytes_ptr =
1049                         raw_cpu_ptr(o->od_extent_bytes_percpu);
1050
1051         if (likely(*extent_bytes_ptr))
1052                 return *extent_bytes_ptr;
1053
1054         /* initialize on first access or CPU hotplug */
1055         if (!ldiskfs_has_feature_extents(osd_sb(o)))
1056                 *extent_bytes_ptr = 1 << osd_sb(o)->s_blocksize_bits;
1057         else
1058                 *extent_bytes_ptr = OSD_DEFAULT_EXTENT_BYTES;
1059
1060         return *extent_bytes_ptr;
1061 }
1062
1063 #define EXTENT_BYTES_DECAY 64
1064 static void osd_decay_extent_bytes(struct osd_device *osd,
1065                                    unsigned int new_bytes)
1066 {
1067         unsigned int old_bytes;
1068
1069         if (!ldiskfs_has_feature_extents(osd_sb(osd)))
1070                 return;
1071
1072         old_bytes = osd_extent_bytes(osd);
1073         *raw_cpu_ptr(osd->od_extent_bytes_percpu) =
1074                 (old_bytes * (EXTENT_BYTES_DECAY - 1) +
1075                  min(new_bytes, OSD_DEFAULT_EXTENT_BYTES) +
1076                  EXTENT_BYTES_DECAY - 1) / EXTENT_BYTES_DECAY;
1077 }
1078
1079 static int osd_ldiskfs_map_inode_pages(struct inode *inode,
1080                                        struct osd_iobuf *iobuf,
1081                                        struct osd_device *osd,
1082                                        int create, __u64 user_size,
1083                                        int check_credits,
1084                                        struct thandle *thandle)
1085 {
1086         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
1087         int blocksize = 1 << inode->i_blkbits;
1088         int rc = 0, i = 0, mapped_index = 0;
1089         struct page *fp = NULL;
1090         int clen = 0;
1091         pgoff_t max_page_index;
1092         handle_t *handle = NULL;
1093         sector_t start_blocks = 0, count = 0;
1094         loff_t disk_size = 0;
1095         struct page **page = iobuf->dr_pages;
1096         int pages = iobuf->dr_npages;
1097         sector_t *blocks = iobuf->dr_blocks;
1098         struct niobuf_local *lnb1, *lnb2;
1099         loff_t size1, size2;
1100
1101         max_page_index = inode->i_sb->s_maxbytes >> PAGE_SHIFT;
1102
1103         CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
1104                 inode->i_ino, pages, (*page)->index);
1105
1106         if (create) {
1107                 create = LDISKFS_GET_BLOCKS_CREATE;
1108                 handle = ldiskfs_journal_current_handle();
1109                 LASSERT(handle != NULL);
1110                 rc = osd_attach_jinode(inode);
1111                 if (rc)
1112                         return rc;
1113                 disk_size = i_size_read(inode);
1114                 /* if disk_size is already bigger than specified user_size,
1115                  * ignore user_size
1116                  */
1117                 if (disk_size > user_size)
1118                         user_size = 0;
1119         }
1120         /* pages are sorted already. so, we just have to find
1121          * contig. space and process them properly
1122          */
1123         while (i < pages) {
1124                 long blen, total = 0, previous_total = 0;
1125                 struct ldiskfs_map_blocks map = { 0 };
1126
1127                 if (fp == NULL) { /* start new extent */
1128                         fp = *page++;
1129                         clen = 1;
1130                         if (++i != pages)
1131                                 continue;
1132                 } else if (fp->index + clen == (*page)->index) {
1133                         /* continue the extent */
1134                         page++;
1135                         clen++;
1136                         if (++i != pages)
1137                                 continue;
1138                 }
1139                 if (fp->index + clen >= max_page_index)
1140                         GOTO(cleanup, rc = -EFBIG);
1141                 /* process found extent */
1142                 map.m_lblk = fp->index * blocks_per_page;
1143                 map.m_len = blen = clen * blocks_per_page;
1144
1145                 /*
1146                  * For PAGE_SIZE > blocksize block allocation mapping, the
1147                  * ldiskfs_map_blocks() aims at looking up already mapped
1148                  * blocks, recording them to iobuf->dr_blocks and fixing up
1149                  * m_lblk, m_len for un-allocated blocks to be created/mapped
1150                  * in the second ldiskfs_map_blocks().
1151                  *
1152                  * M_lblk should be the first un-allocated block if m_lblk
1153                  * points at an already allocated block when create = 1,
1154                  * ldiskfs_map_blocks() will just return with already
1155                  * allocated blocks and without allocating any requested
1156                  * new blocks for the extent. For PAGE_SIZE = blocksize
1157                  * case, if m_lblk points at an already allocated block it
1158                  * will point at an un-allocated block in next restart
1159                  * transaction, because the already mapped block/page will
1160                  * be filtered out in next restart transaction via flag
1161                  * OBD_BRW_DONE in osd_declare_write_commit().
1162                  */
1163                 if (create && PAGE_SIZE > blocksize) {
1164                         /* With flags=0 just for already mapped blocks lookup */
1165                         rc = ldiskfs_map_blocks(handle, inode, &map, 0);
1166                         if (rc > 0 && map.m_flags & LDISKFS_MAP_MAPPED) {
1167                                 for (; total < blen && total < map.m_len;
1168                                                 total++)
1169                                         *(blocks + total) = map.m_pblk + total;
1170
1171                                 /* The extent is already full mapped */
1172                                 if (total == blen) {
1173                                         rc = 0;
1174                                         goto ext_already_mapped;
1175                                 }
1176                         }
1177                         /*
1178                          * Fixup or reset m_lblk and m_len for un-mapped blocks.
1179                          * The second ldiskfs_map_blocks() will create and map
1180                          * them.
1181                          */
1182                         map.m_lblk = fp->index * blocks_per_page + total;
1183                         map.m_len = blen - total;
1184                 }
1185
1186 cont_map:
1187                 /**
1188                  * We might restart transaction for block allocations,
1189                  * in order to make sure data ordered mode, issue IO, disk
1190                  * size update and block allocations need be within same
1191                  * transaction to make sure consistency.
1192                  */
1193                 if (handle && check_credits) {
1194                         struct osd_thandle *oh;
1195
1196                         LASSERT(thandle != NULL);
1197                         oh = container_of(thandle, struct osd_thandle,
1198                                           ot_super);
1199                         /*
1200                          * only issue IO if restart transaction needed,
1201                          * as update disk size need hold inode lock, we
1202                          * want to avoid that as much as possible.
1203                          */
1204                         if (oh->oh_declared_ext <= 0) {
1205                                 rc = osd_ldiskfs_map_write(inode,
1206                                         iobuf, osd, start_blocks,
1207                                         count, &disk_size, user_size);
1208                                 if (rc)
1209                                         GOTO(cleanup, rc);
1210                                 thandle->th_restart_tran = 1;
1211                                 GOTO(cleanup, rc = -EAGAIN);
1212                         }
1213
1214                         if (OBD_FAIL_CHECK(OBD_FAIL_OST_RESTART_IO))
1215                                 oh->oh_declared_ext = 0;
1216                         else
1217                                 oh->oh_declared_ext--;
1218                 }
1219                 rc = ldiskfs_map_blocks(handle, inode, &map, create);
1220                 if (rc >= 0) {
1221                         int c = 0;
1222
1223                         for (; total < blen && c < map.m_len; c++, total++) {
1224                                 if (rc == 0) {
1225                                         *(blocks + total) = 0;
1226                                         total++;
1227                                         break;
1228                                 }
1229                                 if ((map.m_flags & LDISKFS_MAP_UNWRITTEN) &&
1230                                     !create) {
1231                                         /* don't try to read allocated, but
1232                                          * unwritten blocks, instead fill the
1233                                          * patches with zeros in osd_do_bio() */
1234                                         *(blocks + total) = 0;
1235                                         continue;
1236                                 }
1237                                 *(blocks + total) = map.m_pblk + c;
1238                                 /* unmap any possible underlying
1239                                  * metadata from the block device
1240                                  * mapping.  b=6998.
1241                                  */
1242                                 if ((map.m_flags & LDISKFS_MAP_NEW) &&
1243                                     create)
1244                                         clean_bdev_aliases(inode->i_sb->s_bdev,
1245                                                            map.m_pblk + c, 1);
1246                         }
1247                         rc = 0;
1248                 }
1249
1250 ext_already_mapped:
1251                 if (rc == 0 && create) {
1252                         count += (total - previous_total);
1253                         mapped_index = (count + blocks_per_page -
1254                                         1) / blocks_per_page - 1;
1255                         lnb1 = iobuf->dr_lnbs[i - clen];
1256                         lnb2 = iobuf->dr_lnbs[mapped_index];
1257                         size1 = lnb1->lnb_file_offset -
1258                                 (lnb1->lnb_file_offset % PAGE_SIZE) +
1259                                 (total << inode->i_blkbits);
1260                         size2 = lnb2->lnb_file_offset + lnb2->lnb_len;
1261
1262                         if (size1 > size2)
1263                                 size1 = size2;
1264                         if (size1 > disk_size)
1265                                 disk_size = size1;
1266                 }
1267
1268                 if (rc == 0 && total < blen) {
1269                         /*
1270                          * decay extent blocks if we could not
1271                          * allocate extent once.
1272                          */
1273                         osd_decay_extent_bytes(osd,
1274                                 (total - previous_total) << inode->i_blkbits);
1275                         map.m_lblk = fp->index * blocks_per_page + total;
1276                         map.m_len = blen - total;
1277                         previous_total = total;
1278                         goto cont_map;
1279                 }
1280                 if (rc != 0)
1281                         GOTO(cleanup, rc);
1282                 /*
1283                  * decay extent blocks if we could allocate
1284                  * good large extent.
1285                  */
1286                 if (total - previous_total >=
1287                     osd_extent_bytes(osd) >> inode->i_blkbits)
1288                         osd_decay_extent_bytes(osd,
1289                                 (total - previous_total) << inode->i_blkbits);
1290                 /* look for next extent */
1291                 fp = NULL;
1292                 blocks += blocks_per_page * clen;
1293         }
1294 cleanup:
1295         if (rc == 0 && create &&
1296             start_blocks < pages * blocks_per_page) {
1297                 rc = osd_ldiskfs_map_write(inode, iobuf, osd, start_blocks,
1298                                            count, &disk_size, user_size);
1299                 LASSERT(start_blocks + count == pages * blocks_per_page);
1300         }
1301         return rc;
1302 }
1303
1304 static int osd_write_prep(const struct lu_env *env, struct dt_object *dt,
1305                           struct niobuf_local *lnb, int npages)
1306 {
1307         struct osd_thread_info *oti   = osd_oti_get(env);
1308         struct osd_iobuf       *iobuf = &oti->oti_iobuf;
1309         struct inode           *inode = osd_dt_obj(dt)->oo_inode;
1310         struct osd_device      *osd   = osd_obj2dev(osd_dt_obj(dt));
1311         ktime_t start, end;
1312         s64 timediff;
1313         ssize_t isize;
1314         __s64  maxidx;
1315         int i, rc = 0;
1316
1317         LASSERT(inode);
1318
1319         rc = osd_init_iobuf(osd, iobuf, 0, npages);
1320         if (unlikely(rc != 0))
1321                 RETURN(rc);
1322
1323         isize = i_size_read(inode);
1324         maxidx = ((isize + PAGE_SIZE - 1) >> PAGE_SHIFT) - 1;
1325
1326         start = ktime_get();
1327         for (i = 0; i < npages; i++) {
1328
1329                 /*
1330                  * till commit the content of the page is undefined
1331                  * we'll set it uptodate once bulk is done. otherwise
1332                  * subsequent reads can access non-stable data
1333                  */
1334                 ClearPageUptodate(lnb[i].lnb_page);
1335
1336                 if (lnb[i].lnb_len == PAGE_SIZE)
1337                         continue;
1338
1339                 if (maxidx >= lnb[i].lnb_page->index) {
1340                         osd_iobuf_add_page(iobuf, &lnb[i]);
1341                 } else {
1342                         long off;
1343                         char *p = kmap(lnb[i].lnb_page);
1344
1345                         off = lnb[i].lnb_page_offset;
1346                         if (off)
1347                                 memset(p, 0, off);
1348                         off = (lnb[i].lnb_page_offset + lnb[i].lnb_len) &
1349                               ~PAGE_MASK;
1350                         if (off)
1351                                 memset(p + off, 0, PAGE_SIZE - off);
1352                         kunmap(lnb[i].lnb_page);
1353                 }
1354         }
1355         end = ktime_get();
1356         timediff = ktime_us_delta(end, start);
1357         lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1358
1359         if (iobuf->dr_npages) {
1360                 rc = osd_ldiskfs_map_inode_pages(inode, iobuf, osd, 0,
1361                                                  0, 0, NULL);
1362                 if (likely(rc == 0)) {
1363                         rc = osd_do_bio(osd, inode, iobuf, 0, 0);
1364                         /* do IO stats for preparation reads */
1365                         osd_fini_iobuf(osd, iobuf);
1366                 }
1367         }
1368         RETURN(rc);
1369 }
1370
1371 struct osd_fextent {
1372         sector_t        start;
1373         sector_t        end;
1374         __u32           flags;
1375         unsigned int    mapped:1;
1376 };
1377
1378 static int osd_is_mapped(struct dt_object *dt, __u64 offset,
1379                          struct osd_fextent *cached_extent)
1380 {
1381         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1382         sector_t block = offset >> inode->i_blkbits;
1383         sector_t start;
1384         struct fiemap_extent_info fei = { 0 };
1385         struct fiemap_extent fe = { 0 };
1386         int rc;
1387
1388         if (block >= cached_extent->start && block < cached_extent->end)
1389                 return cached_extent->mapped;
1390
1391         if (i_size_read(inode) == 0)
1392                 return 0;
1393
1394         /* Beyond EOF, must not be mapped */
1395         if (((i_size_read(inode) - 1) >> inode->i_blkbits) < block)
1396                 return 0;
1397
1398         fei.fi_extents_max = 1;
1399         fei.fi_extents_start = &fe;
1400
1401         rc = inode->i_op->fiemap(inode, &fei, offset, FIEMAP_MAX_OFFSET-offset);
1402         if (rc != 0)
1403                 return 0;
1404
1405         start = fe.fe_logical >> inode->i_blkbits;
1406         cached_extent->flags = fe.fe_flags;
1407         if (fei.fi_extents_mapped == 0) {
1408                 /* a special case - no extent found at this offset and forward.
1409                  * we can consider this as a hole to EOF. it's safe to cache
1410                  * as other threads can not allocate/punch blocks this thread
1411                  * is working on (LDLM). */
1412                 cached_extent->start = block;
1413                 cached_extent->end = i_size_read(inode) >> inode->i_blkbits;
1414                 cached_extent->mapped = 0;
1415                 return 0;
1416         }
1417
1418         if (start > block) {
1419                 cached_extent->start = block;
1420                 cached_extent->end = start;
1421                 cached_extent->mapped = 0;
1422         } else {
1423                 cached_extent->start = start;
1424                 cached_extent->end = (fe.fe_logical + fe.fe_length) >>
1425                                       inode->i_blkbits;
1426                 cached_extent->mapped = 1;
1427         }
1428
1429         return cached_extent->mapped;
1430 }
1431
1432 #define MAX_EXTENTS_PER_WRITE 100
1433 static int osd_declare_write_commit(const struct lu_env *env,
1434                                     struct dt_object *dt,
1435                                     struct niobuf_local *lnb, int npages,
1436                                     struct thandle *handle)
1437 {
1438         const struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1439         struct inode            *inode = osd_dt_obj(dt)->oo_inode;
1440         struct osd_thandle      *oh;
1441         int                     extents = 0, new_meta = 0;
1442         int                     depth, new_blocks = 0;
1443         int                     i;
1444         int                     dirty_groups = 0;
1445         int                     rc = 0;
1446         int                     credits = 0;
1447         long long               quota_space = 0;
1448         struct osd_fextent      mapped = { 0 }, extent = { 0 };
1449         enum osd_quota_local_flags local_flags = 0;
1450         enum osd_qid_declare_flags declare_flags = OSD_QID_BLK;
1451         unsigned int            extent_bytes;
1452         ENTRY;
1453
1454         LASSERT(handle != NULL);
1455         oh = container_of(handle, struct osd_thandle, ot_super);
1456         LASSERT(oh->ot_handle == NULL);
1457
1458         /*
1459          * We track a decaying average extent blocks per filesystem,
1460          * for most of time, it will be 1M, with filesystem becoming
1461          * heavily-fragmented, it will be reduced to 4K at the worst.
1462          */
1463         extent_bytes = osd_extent_bytes(osd);
1464         LASSERT(extent_bytes >= osd_sb(osd)->s_blocksize);
1465
1466         /* calculate number of extents (probably better to pass nb) */
1467         for (i = 0; i < npages; i++) {
1468                 /* ignore quota for the whole request if any page is from
1469                  * client cache or written by root.
1470                  *
1471                  * XXX we could handle this on per-lnb basis as done by
1472                  * grant.
1473                  */
1474                 if ((lnb[i].lnb_flags & OBD_BRW_NOQUOTA) ||
1475                     (lnb[i].lnb_flags & OBD_BRW_SYS_RESOURCE) ||
1476                     !(lnb[i].lnb_flags & OBD_BRW_SYNC))
1477                         declare_flags |= OSD_QID_FORCE;
1478
1479                 /*
1480                  * Convert unwritten extent might need split extents, could
1481                  * not skip it.
1482                  */
1483                 if (osd_is_mapped(dt, lnb[i].lnb_file_offset, &mapped) &&
1484                     !(mapped.flags & FIEMAP_EXTENT_UNWRITTEN)) {
1485                         lnb[i].lnb_flags |= OBD_BRW_MAPPED;
1486                         continue;
1487                 }
1488
1489                 if (lnb[i].lnb_flags & OBD_BRW_DONE) {
1490                         lnb[i].lnb_flags |= OBD_BRW_MAPPED;
1491                         continue;
1492                 }
1493
1494                 /* count only unmapped changes */
1495                 new_blocks++;
1496                 if (lnb[i].lnb_file_offset != extent.end || extent.end == 0) {
1497                         if (extent.end != 0)
1498                                 extents += (extent.end - extent.start +
1499                                             extent_bytes - 1) / extent_bytes;
1500                         extent.start = lnb[i].lnb_file_offset;
1501                         extent.end = lnb[i].lnb_file_offset + lnb[i].lnb_len;
1502                 } else {
1503                         extent.end += lnb[i].lnb_len;
1504                 }
1505
1506                 quota_space += PAGE_SIZE;
1507         }
1508
1509         credits++; /* inode */
1510         /*
1511          * overwrite case, no need to modify tree and
1512          * allocate blocks.
1513          */
1514         if (!extent.end)
1515                 goto out_declare;
1516
1517         extents += (extent.end - extent.start +
1518                     extent_bytes - 1) / extent_bytes;
1519         /**
1520          * with system space usage growing up, mballoc codes won't
1521          * try best to scan block group to align best free extent as
1522          * we can. So extent bytes per extent could be decayed to a
1523          * very small value, this could make us reserve too many credits.
1524          * We could be more optimistic in the credit reservations, even
1525          * in a case where the filesystem is nearly full, it is extremely
1526          * unlikely that the worst case would ever be hit.
1527          */
1528         if (extents > MAX_EXTENTS_PER_WRITE)
1529                 extents = MAX_EXTENTS_PER_WRITE;
1530
1531         /**
1532          * If we add a single extent, then in the worse case, each tree
1533          * level index/leaf need to be changed in case of the tree split.
1534          * If more extents are inserted, they could cause the whole tree
1535          * split more than once, but this is really rare.
1536          */
1537         if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
1538                 /*
1539                  * many concurrent threads may grow tree by the time
1540                  * our transaction starts. so, consider 2 is a min depth.
1541                  */
1542                 depth = ext_depth(inode);
1543                 depth = min(max(depth, 1) + 1, LDISKFS_MAX_EXTENT_DEPTH);
1544                 if (extents <= 1) {
1545                         credits += depth * 2 * extents;
1546                         new_meta = depth;
1547                 } else {
1548                         credits += depth * 3 * extents;
1549                         new_meta = depth * 2 * extents;
1550                 }
1551         } else {
1552                 /*
1553                  * With N contiguous data blocks, we need at most
1554                  * N/EXT4_ADDR_PER_BLOCK(inode->i_sb) + 1 indirect blocks,
1555                  * 2 dindirect blocks, and 1 tindirect block
1556                  */
1557                 new_meta = DIV_ROUND_UP(new_blocks,
1558                                 LDISKFS_ADDR_PER_BLOCK(inode->i_sb)) + 4;
1559                 credits += new_meta;
1560         }
1561         dirty_groups += (extents + new_meta);
1562
1563         oh->oh_declared_ext = extents;
1564
1565         /* quota space for metadata blocks */
1566         quota_space += new_meta * LDISKFS_BLOCK_SIZE(osd_sb(osd));
1567
1568         /* quota space should be reported in 1K blocks */
1569         quota_space = toqb(quota_space);
1570
1571         /* each new block can go in different group (bitmap + gd) */
1572
1573         /* we can't dirty more bitmap blocks than exist */
1574         if (dirty_groups > LDISKFS_SB(osd_sb(osd))->s_groups_count)
1575                 credits += LDISKFS_SB(osd_sb(osd))->s_groups_count;
1576         else
1577                 credits += dirty_groups;
1578
1579         /* we can't dirty more gd blocks than exist */
1580         if (dirty_groups > LDISKFS_SB(osd_sb(osd))->s_gdb_count)
1581                 credits += LDISKFS_SB(osd_sb(osd))->s_gdb_count;
1582         else
1583                 credits += dirty_groups;
1584
1585         CDEBUG(D_INODE,
1586                "%s: inode #%lu extent_bytes %u extents %d credits %d\n",
1587                osd_ino2name(inode), inode->i_ino, extent_bytes, extents,
1588                credits);
1589
1590 out_declare:
1591         osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1592
1593         /* make sure the over quota flags were not set */
1594         lnb[0].lnb_flags &= ~OBD_BRW_OVER_ALLQUOTA;
1595
1596         rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1597                                    i_projid_read(inode), quota_space, oh,
1598                                    osd_dt_obj(dt), &local_flags, declare_flags);
1599
1600         /* we need only to store the overquota flags in the first lnb for
1601          * now, once we support multiple objects BRW, this code needs be
1602          * revised.
1603          */
1604         if (local_flags & QUOTA_FL_OVER_USRQUOTA)
1605                 lnb[0].lnb_flags |= OBD_BRW_OVER_USRQUOTA;
1606         if (local_flags & QUOTA_FL_OVER_GRPQUOTA)
1607                 lnb[0].lnb_flags |= OBD_BRW_OVER_GRPQUOTA;
1608         if (local_flags & QUOTA_FL_OVER_PRJQUOTA)
1609                 lnb[0].lnb_flags |= OBD_BRW_OVER_PRJQUOTA;
1610
1611         if (rc == 0)
1612                 rc = osd_trunc_lock(osd_dt_obj(dt), oh, true);
1613
1614         RETURN(rc);
1615 }
1616
1617 /* Check if a block is allocated or not */
1618 static int osd_write_commit(const struct lu_env *env, struct dt_object *dt,
1619                             struct niobuf_local *lnb, int npages,
1620                             struct thandle *thandle, __u64 user_size)
1621 {
1622         struct osd_thread_info *oti = osd_oti_get(env);
1623         struct osd_iobuf *iobuf = &oti->oti_iobuf;
1624         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1625         struct osd_device  *osd = osd_obj2dev(osd_dt_obj(dt));
1626         int rc = 0, i, check_credits = 0;
1627
1628         LASSERT(inode);
1629
1630         rc = osd_init_iobuf(osd, iobuf, 1, npages);
1631         if (unlikely(rc != 0))
1632                 RETURN(rc);
1633
1634         dquot_initialize(inode);
1635
1636         for (i = 0; i < npages; i++) {
1637                 if (lnb[i].lnb_rc == -ENOSPC &&
1638                     (lnb[i].lnb_flags & OBD_BRW_MAPPED)) {
1639                         /* Allow the write to proceed if overwriting an
1640                          * existing block
1641                          */
1642                         lnb[i].lnb_rc = 0;
1643                 }
1644
1645                 if (lnb[i].lnb_rc) { /* ENOSPC, network RPC error, etc. */
1646                         CDEBUG(D_INODE, "Skipping [%d] == %d\n", i,
1647                                lnb[i].lnb_rc);
1648                         LASSERT(lnb[i].lnb_page);
1649                         generic_error_remove_page(inode->i_mapping,
1650                                                   lnb[i].lnb_page);
1651                         continue;
1652                 }
1653
1654                 if (lnb[i].lnb_flags & OBD_BRW_DONE)
1655                         continue;
1656
1657                 if (!(lnb[i].lnb_flags & OBD_BRW_MAPPED))
1658                         check_credits = 1;
1659
1660                 LASSERT(PageLocked(lnb[i].lnb_page));
1661                 LASSERT(!PageWriteback(lnb[i].lnb_page));
1662
1663                 /*
1664                  * Since write and truncate are serialized by oo_sem, even
1665                  * partial-page truncate should not leave dirty pages in the
1666                  * page cache.
1667                  */
1668                 LASSERT(!PageDirty(lnb[i].lnb_page));
1669
1670                 SetPageUptodate(lnb[i].lnb_page);
1671
1672                 osd_iobuf_add_page(iobuf, &lnb[i]);
1673         }
1674
1675         osd_trans_exec_op(env, thandle, OSD_OT_WRITE);
1676
1677         if (OBD_FAIL_CHECK(OBD_FAIL_OST_MAPBLK_ENOSPC)) {
1678                 rc = -ENOSPC;
1679         } else if (iobuf->dr_npages > 0) {
1680                 rc = osd_ldiskfs_map_inode_pages(inode, iobuf, osd,
1681                                                  1, user_size,
1682                                                  check_credits,
1683                                                  thandle);
1684         } else {
1685                 /* no pages to write, no transno is needed */
1686                 thandle->th_local = 1;
1687         }
1688
1689         if (rc != 0 && !thandle->th_restart_tran)
1690                 osd_fini_iobuf(osd, iobuf);
1691
1692         osd_trans_exec_check(env, thandle, OSD_OT_WRITE);
1693
1694         if (unlikely(rc != 0 && !thandle->th_restart_tran)) {
1695                 /* if write fails, we should drop pages from the cache */
1696                 for (i = 0; i < npages; i++) {
1697                         if (lnb[i].lnb_page == NULL)
1698                                 continue;
1699                         if (!PagePrivate2(lnb[i].lnb_page)) {
1700                                 LASSERT(PageLocked(lnb[i].lnb_page));
1701                                 generic_error_remove_page(inode->i_mapping,
1702                                                           lnb[i].lnb_page);
1703                         }
1704                 }
1705         }
1706
1707         RETURN(rc);
1708 }
1709
1710 static int osd_read_prep(const struct lu_env *env, struct dt_object *dt,
1711                          struct niobuf_local *lnb, int npages)
1712 {
1713         struct osd_thread_info *oti = osd_oti_get(env);
1714         struct osd_iobuf *iobuf = &oti->oti_iobuf;
1715         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1716         struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1717         int rc = 0, i, cache_hits = 0, cache_misses = 0;
1718         ktime_t start, end;
1719         s64 timediff;
1720         loff_t isize;
1721
1722         LASSERT(inode);
1723
1724         rc = osd_init_iobuf(osd, iobuf, 0, npages);
1725         if (unlikely(rc != 0))
1726                 RETURN(rc);
1727
1728         isize = i_size_read(inode);
1729
1730         start = ktime_get();
1731         for (i = 0; i < npages; i++) {
1732
1733                 if (isize <= lnb[i].lnb_file_offset)
1734                         /* If there's no more data, abort early.
1735                          * lnb->lnb_rc == 0, so it's easy to detect later.
1736                          */
1737                         break;
1738
1739                 /* instead of looking if we go beyong isize, send complete
1740                  * pages all the time
1741                  */
1742                 lnb[i].lnb_rc = lnb[i].lnb_len;
1743
1744                 /* Bypass disk read if fail_loc is set properly */
1745                 if (OBD_FAIL_CHECK_QUIET(OBD_FAIL_OST_FAKE_RW))
1746                         SetPageUptodate(lnb[i].lnb_page);
1747
1748                 if (PageUptodate(lnb[i].lnb_page)) {
1749                         cache_hits++;
1750                         unlock_page(lnb[i].lnb_page);
1751                 } else {
1752                         cache_misses++;
1753                         osd_iobuf_add_page(iobuf, &lnb[i]);
1754                 }
1755                 /* no need to unlock in osd_bufs_put(), the sooner page is
1756                  * unlocked, the earlier another client can access it.
1757                  * notice real unlock_page() can be called few lines
1758                  * below after osd_do_bio(). lnb is a per-thread, so it's
1759                  * fine to have PG_locked and lnb_locked inconsistent here
1760                  */
1761                 lnb[i].lnb_locked = 0;
1762         }
1763         end = ktime_get();
1764         timediff = ktime_us_delta(end, start);
1765         lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1766
1767         if (cache_hits != 0)
1768                 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_HIT,
1769                                     cache_hits);
1770         if (cache_misses != 0)
1771                 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_MISS,
1772                                     cache_misses);
1773         if (cache_hits + cache_misses != 0)
1774                 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_ACCESS,
1775                                     cache_hits + cache_misses);
1776
1777         if (iobuf->dr_npages) {
1778                 rc = osd_ldiskfs_map_inode_pages(inode, iobuf, osd, 0,
1779                                                  0, 0, NULL);
1780                 if (!rc)
1781                         rc = osd_do_bio(osd, inode, iobuf, 0, 0);
1782
1783                 /* IO stats will be done in osd_bufs_put() */
1784
1785                 /* early release to let others read data during the bulk */
1786                 for (i = 0; i < iobuf->dr_npages; i++) {
1787                         LASSERT(PageLocked(iobuf->dr_pages[i]));
1788                         if (!PagePrivate2(iobuf->dr_pages[i]))
1789                                 unlock_page(iobuf->dr_pages[i]);
1790                 }
1791         }
1792
1793         RETURN(rc);
1794 }
1795
1796 /*
1797  * XXX: Another layering violation for now.
1798  *
1799  * We don't want to use ->f_op->read methods, because generic file write
1800  *
1801  *         - serializes on ->i_sem, and
1802  *
1803  *         - does a lot of extra work like balance_dirty_pages(),
1804  *
1805  * which doesn't work for globally shared files like /last_rcvd.
1806  */
1807 static int osd_ldiskfs_readlink(struct inode *inode, char *buffer, int buflen)
1808 {
1809         struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
1810
1811         memcpy(buffer, (char *)ei->i_data, buflen);
1812
1813         return  buflen;
1814 }
1815
1816 int osd_ldiskfs_read(struct inode *inode, void *buf, int size, loff_t *offs)
1817 {
1818         struct buffer_head *bh;
1819         unsigned long block;
1820         int osize;
1821         int blocksize;
1822         int csize;
1823         int boffs;
1824
1825         /* prevent reading after eof */
1826         spin_lock(&inode->i_lock);
1827         if (i_size_read(inode) < *offs + size) {
1828                 loff_t diff = i_size_read(inode) - *offs;
1829
1830                 spin_unlock(&inode->i_lock);
1831                 if (diff < 0) {
1832                         CDEBUG(D_OTHER,
1833                                "size %llu is too short to read @%llu\n",
1834                                i_size_read(inode), *offs);
1835                         return -EBADR;
1836                 } else if (diff == 0) {
1837                         return 0;
1838                 } else {
1839                         size = diff;
1840                 }
1841         } else {
1842                 spin_unlock(&inode->i_lock);
1843         }
1844
1845         blocksize = 1 << inode->i_blkbits;
1846         osize = size;
1847         while (size > 0) {
1848                 block = *offs >> inode->i_blkbits;
1849                 boffs = *offs & (blocksize - 1);
1850                 csize = min(blocksize - boffs, size);
1851                 bh = __ldiskfs_bread(NULL, inode, block, 0);
1852                 if (IS_ERR(bh)) {
1853                         CERROR("%s: can't read %u@%llu on ino %lu: rc = %ld\n",
1854                                osd_ino2name(inode), csize, *offs, inode->i_ino,
1855                                PTR_ERR(bh));
1856                         return PTR_ERR(bh);
1857                 }
1858
1859                 if (bh != NULL) {
1860                         memcpy(buf, bh->b_data + boffs, csize);
1861                         brelse(bh);
1862                 } else {
1863                         memset(buf, 0, csize);
1864                 }
1865
1866                 *offs += csize;
1867                 buf += csize;
1868                 size -= csize;
1869         }
1870         return osize;
1871 }
1872
1873 static ssize_t osd_read(const struct lu_env *env, struct dt_object *dt,
1874                         struct lu_buf *buf, loff_t *pos)
1875 {
1876         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1877         int rc;
1878
1879         /* Read small symlink from inode body as we need to maintain correct
1880          * on-disk symlinks for ldiskfs.
1881          */
1882         if (S_ISLNK(dt->do_lu.lo_header->loh_attr)) {
1883                 loff_t size = i_size_read(inode);
1884
1885                 if (buf->lb_len < size)
1886                         return -EOVERFLOW;
1887
1888                 if (size < sizeof(LDISKFS_I(inode)->i_data))
1889                         rc = osd_ldiskfs_readlink(inode, buf->lb_buf, size);
1890                 else
1891                         rc = osd_ldiskfs_read(inode, buf->lb_buf, size, pos);
1892         } else {
1893                 rc = osd_ldiskfs_read(inode, buf->lb_buf, buf->lb_len, pos);
1894         }
1895
1896         return rc;
1897 }
1898
1899 static inline int osd_extents_enabled(struct super_block *sb,
1900                                       struct inode *inode)
1901 {
1902         if (inode != NULL) {
1903                 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL)
1904                         return 1;
1905         } else if (ldiskfs_has_feature_extents(sb)) {
1906                 return 1;
1907         }
1908         return 0;
1909 }
1910
1911 int osd_calc_bkmap_credits(struct super_block *sb, struct inode *inode,
1912                            const loff_t size, const loff_t pos,
1913                            const int blocks)
1914 {
1915         int credits, bits, bs, i;
1916
1917         bits = sb->s_blocksize_bits;
1918         bs = 1 << bits;
1919
1920         /* legacy blockmap: 3 levels * 3 (bitmap,gd,itself)
1921          * we do not expect blockmaps on the large files,
1922          * so let's shrink it to 2 levels (4GB files)
1923          */
1924
1925         /* this is default reservation: 2 levels */
1926         credits = (blocks + 2) * 3;
1927
1928         /* actual offset is unknown, hard to optimize */
1929         if (pos == -1)
1930                 return credits;
1931
1932         /* now check for few specific cases to optimize */
1933         if (pos + size <= LDISKFS_NDIR_BLOCKS * bs) {
1934                 /* no indirects */
1935                 credits = blocks;
1936                 /* allocate if not allocated */
1937                 if (inode == NULL) {
1938                         credits += blocks * 2;
1939                         return credits;
1940                 }
1941                 for (i = (pos >> bits); i < (pos >> bits) + blocks; i++) {
1942                         LASSERT(i < LDISKFS_NDIR_BLOCKS);
1943                         if (LDISKFS_I(inode)->i_data[i] == 0)
1944                                 credits += 2;
1945                 }
1946         } else if (pos + size <= (LDISKFS_NDIR_BLOCKS + 1024) * bs) {
1947                 /* single indirect */
1948                 credits = blocks * 3;
1949                 if (inode == NULL ||
1950                     LDISKFS_I(inode)->i_data[LDISKFS_IND_BLOCK] == 0)
1951                         credits += 3;
1952                 else
1953                         /* The indirect block may be modified. */
1954                         credits += 1;
1955         }
1956
1957         return credits;
1958 }
1959
1960 static ssize_t osd_declare_write(const struct lu_env *env, struct dt_object *dt,
1961                                  const struct lu_buf *buf, loff_t _pos,
1962                                  struct thandle *handle)
1963 {
1964         struct osd_object  *obj  = osd_dt_obj(dt);
1965         struct inode       *inode = obj->oo_inode;
1966         struct super_block *sb = osd_sb(osd_obj2dev(obj));
1967         struct osd_thandle *oh;
1968         int                 rc = 0, est = 0, credits, blocks, allocated = 0;
1969         int                 bits, bs;
1970         int                 depth, size;
1971         loff_t              pos;
1972         ENTRY;
1973
1974         LASSERT(buf != NULL);
1975         LASSERT(handle != NULL);
1976
1977         oh = container_of(handle, struct osd_thandle, ot_super);
1978         LASSERT(oh->ot_handle == NULL);
1979
1980         size = buf->lb_len;
1981         bits = sb->s_blocksize_bits;
1982         bs = 1 << bits;
1983
1984         if (_pos == -1) {
1985                 /* if this is an append, then we
1986                  * should expect cross-block record
1987                  */
1988                 pos = 0;
1989         } else {
1990                 pos = _pos;
1991         }
1992
1993         /* blocks to modify */
1994         blocks = ((pos + size + bs - 1) >> bits) - (pos >> bits);
1995         LASSERT(blocks > 0);
1996
1997         if (inode != NULL && _pos != -1) {
1998                 /* object size in blocks */
1999                 est = (i_size_read(inode) + bs - 1) >> bits;
2000                 allocated = inode->i_blocks >> (bits - 9);
2001                 if (pos + size <= i_size_read(inode) && est <= allocated) {
2002                         /* looks like an overwrite, no need to modify tree */
2003                         credits = blocks;
2004                         /* no need to modify i_size */
2005                         goto out;
2006                 }
2007         }
2008
2009         if (osd_extents_enabled(sb, inode)) {
2010                 /*
2011                  * many concurrent threads may grow tree by the time
2012                  * our transaction starts. so, consider 2 is a min depth
2013                  * for every level we may need to allocate a new block
2014                  * and take some entries from the old one. so, 3 blocks
2015                  * to allocate (bitmap, gd, itself) + old block - 4 per
2016                  * level.
2017                  */
2018                 depth = inode != NULL ? ext_depth(inode) : 0;
2019                 depth = min(max(depth, 1) + 3, LDISKFS_MAX_EXTENT_DEPTH);
2020                 credits = depth;
2021                 /* if not append, then split may need to modify
2022                  * existing blocks moving entries into the new ones
2023                  */
2024                 if (_pos != -1)
2025                         credits += depth;
2026                 /* blocks to store data: bitmap,gd,itself */
2027                 credits += blocks * 3;
2028         } else {
2029                 credits = osd_calc_bkmap_credits(sb, inode, size, _pos, blocks);
2030         }
2031         /* if inode is created as part of the transaction,
2032          * then it's counted already by the creation method
2033          */
2034         if (inode != NULL)
2035                 credits++;
2036
2037 out:
2038
2039         osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
2040
2041         /* dt_declare_write() is usually called for system objects, such
2042          * as llog or last_rcvd files. We needn't enforce quota on those
2043          * objects, so always set the lqi_space as 0.
2044          */
2045         if (inode != NULL)
2046                 rc = osd_declare_inode_qid(env, i_uid_read(inode),
2047                                            i_gid_read(inode),
2048                                            i_projid_read(inode), 0,
2049                                            oh, obj, NULL, OSD_QID_BLK);
2050
2051         if (rc == 0)
2052                 rc = osd_trunc_lock(obj, oh, true);
2053
2054         RETURN(rc);
2055 }
2056
2057 static int osd_ldiskfs_writelink(struct inode *inode, char *buffer, int buflen)
2058 {
2059         /* LU-2634: clear the extent format for fast symlink */
2060         ldiskfs_clear_inode_flag(inode, LDISKFS_INODE_EXTENTS);
2061
2062         memcpy((char *)&LDISKFS_I(inode)->i_data, (char *)buffer, buflen);
2063         spin_lock(&inode->i_lock);
2064         LDISKFS_I(inode)->i_disksize = buflen;
2065         i_size_write(inode, buflen);
2066         spin_unlock(&inode->i_lock);
2067         osd_dirty_inode(inode, I_DIRTY_DATASYNC);
2068
2069         return 0;
2070 }
2071
2072 static int osd_ldiskfs_write_record(struct dt_object *dt, void *buf,
2073                                     int bufsize, int write_NUL, loff_t *offs,
2074                                     handle_t *handle)
2075 {
2076         struct inode *inode = osd_dt_obj(dt)->oo_inode;
2077         struct buffer_head *bh        = NULL;
2078         loff_t              offset    = *offs;
2079         loff_t              new_size  = i_size_read(inode);
2080         unsigned long       block;
2081         int                 blocksize = 1 << inode->i_blkbits;
2082         struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
2083         int                 err = 0;
2084         int                 size;
2085         int                 boffs;
2086         int                 dirty_inode = 0;
2087         bool create, sparse, sync = false;
2088
2089         if (write_NUL) {
2090                 /*
2091                  * long symlink write does not count the NUL terminator in
2092                  * bufsize, we write it, and the inode's file size does not
2093                  * count the NUL terminator as well.
2094                  */
2095                 ((char *)buf)[bufsize] = '\0';
2096                 ++bufsize;
2097         }
2098
2099         /* only the first flag-set matters */
2100         dirty_inode = !test_and_set_bit(LDISKFS_INODE_JOURNAL_DATA,
2101                                        &ei->i_flags);
2102
2103         /* sparse checking is racy, but sparse is very rare case, leave as is */
2104         sparse = (new_size > 0 && (inode->i_blocks >> (inode->i_blkbits - 9)) <
2105                   ((new_size - 1) >> inode->i_blkbits) + 1);
2106
2107         while (bufsize > 0) {
2108                 int credits = handle->h_buffer_credits;
2109                 unsigned long last_block = (new_size == 0) ? 0 :
2110                                            (new_size - 1) >> inode->i_blkbits;
2111
2112                 if (bh)
2113                         brelse(bh);
2114
2115                 block = offset >> inode->i_blkbits;
2116                 boffs = offset & (blocksize - 1);
2117                 size = min(blocksize - boffs, bufsize);
2118                 sync = (block > last_block || new_size == 0 || sparse);
2119
2120                 if (sync)
2121                         down(&ei->i_append_sem);
2122
2123                 bh = __ldiskfs_bread(handle, inode, block, 0);
2124
2125                 if (unlikely(IS_ERR_OR_NULL(bh) && !sync))
2126                         CWARN(
2127                               "%s: adding bh without locking off %llu (block %lu, size %d, offs %llu)\n",
2128                               osd_ino2name(inode),
2129                               offset, block, bufsize, *offs);
2130
2131                 if (IS_ERR_OR_NULL(bh)) {
2132                         struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
2133                         int flags = LDISKFS_GET_BLOCKS_CREATE;
2134
2135                         /* while the file system is being mounted, avoid
2136                          * preallocation otherwise mount can take a long
2137                          * time as mballoc cache is cold.
2138                          * XXX: this is a workaround until we have a proper
2139                          *      fix in mballoc
2140                          * XXX: works with extent-based files only */
2141                         if (!osd->od_cl_seq)
2142                                 flags |= LDISKFS_GET_BLOCKS_NO_NORMALIZE;
2143                         bh = __ldiskfs_bread(handle, inode, block, flags);
2144                         create = true;
2145                 } else {
2146                         if (sync) {
2147                                 up(&ei->i_append_sem);
2148                                 sync = false;
2149                         }
2150                         create = false;
2151                 }
2152                 if (IS_ERR_OR_NULL(bh)) {
2153                         if (bh == NULL) {
2154                                 err = -EIO;
2155                         } else {
2156                                 err = PTR_ERR(bh);
2157                                 bh = NULL;
2158                         }
2159
2160                         CERROR(
2161                                "%s: error reading offset %llu (block %lu, size %d, offs %llu), credits %d/%d: rc = %d\n",
2162                                osd_ino2name(inode), offset, block, bufsize,
2163                                *offs, credits, handle->h_buffer_credits, err);
2164                         break;
2165                 }
2166
2167                 err = ldiskfs_journal_get_write_access(handle, bh);
2168                 if (err) {
2169                         CERROR("journal_get_write_access() returned error %d\n",
2170                                err);
2171                         break;
2172                 }
2173                 LASSERTF(boffs + size <= bh->b_size,
2174                          "boffs %d size %d bh->b_size %lu\n",
2175                          boffs, size, (unsigned long)bh->b_size);
2176                 if (create) {
2177                         memset(bh->b_data, 0, bh->b_size);
2178                         if (sync) {
2179                                 up(&ei->i_append_sem);
2180                                 sync = false;
2181                         }
2182                 }
2183                 memcpy(bh->b_data + boffs, buf, size);
2184                 err = ldiskfs_handle_dirty_metadata(handle, NULL, bh);
2185                 if (err)
2186                         break;
2187
2188                 if (offset + size > new_size)
2189                         new_size = offset + size;
2190                 offset += size;
2191                 bufsize -= size;
2192                 buf += size;
2193         }
2194         if (sync)
2195                 up(&ei->i_append_sem);
2196
2197         if (bh)
2198                 brelse(bh);
2199
2200         if (write_NUL)
2201                 --new_size;
2202         /* correct in-core and on-disk sizes */
2203         if (new_size > i_size_read(inode)) {
2204                 spin_lock(&inode->i_lock);
2205                 if (new_size > i_size_read(inode))
2206                         i_size_write(inode, new_size);
2207                 if (i_size_read(inode) > ei->i_disksize) {
2208                         ei->i_disksize = i_size_read(inode);
2209                         dirty_inode = 1;
2210                 }
2211                 spin_unlock(&inode->i_lock);
2212         }
2213         if (dirty_inode)
2214                 osd_dirty_inode(inode, I_DIRTY_DATASYNC);
2215
2216         if (err == 0)
2217                 *offs = offset;
2218         return err;
2219 }
2220
2221 static ssize_t osd_write(const struct lu_env *env, struct dt_object *dt,
2222                          const struct lu_buf *buf, loff_t *pos,
2223                          struct thandle *handle)
2224 {
2225         struct inode            *inode = osd_dt_obj(dt)->oo_inode;
2226         struct osd_thandle      *oh;
2227         ssize_t                 result;
2228         int                     is_link;
2229
2230         LASSERT(dt_object_exists(dt));
2231
2232         LASSERT(handle != NULL);
2233         LASSERT(inode != NULL);
2234         dquot_initialize(inode);
2235
2236         /* XXX: don't check: one declared chunk can be used many times */
2237         /* osd_trans_exec_op(env, handle, OSD_OT_WRITE); */
2238
2239         oh = container_of(handle, struct osd_thandle, ot_super);
2240         LASSERT(oh->ot_handle->h_transaction != NULL);
2241         osd_trans_exec_op(env, handle, OSD_OT_WRITE);
2242
2243         /* Write small symlink to inode body as we need to maintain correct
2244          * on-disk symlinks for ldiskfs.
2245          * Note: the buf->lb_buf contains a NUL terminator while buf->lb_len
2246          * does not count it in.
2247          */
2248         is_link = S_ISLNK(dt->do_lu.lo_header->loh_attr);
2249         if (is_link && (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
2250                 result = osd_ldiskfs_writelink(inode, buf->lb_buf, buf->lb_len);
2251         else
2252                 result = osd_ldiskfs_write_record(dt, buf->lb_buf, buf->lb_len,
2253                                                   is_link, pos, oh->ot_handle);
2254         if (result == 0)
2255                 result = buf->lb_len;
2256
2257         osd_trans_exec_check(env, handle, OSD_OT_WRITE);
2258
2259         return result;
2260 }
2261
2262 static int osd_declare_fallocate(const struct lu_env *env,
2263                                  struct dt_object *dt, __u64 start, __u64 end,
2264                                  int mode, struct thandle *th)
2265 {
2266         struct osd_thandle *oh = container_of(th, struct osd_thandle, ot_super);
2267         struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
2268         struct inode *inode = osd_dt_obj(dt)->oo_inode;
2269         long long quota_space = 0;
2270         /* 5 is max tree depth. (inode + 4 index blocks) */
2271         int depth = 5;
2272         int rc;
2273
2274         ENTRY;
2275
2276         /*
2277          * mode == 0 (which is standard prealloc) and PUNCH is supported
2278          * Rest of mode options is not supported yet.
2279          */
2280         if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2281                 RETURN(-EOPNOTSUPP);
2282
2283         /* disable fallocate completely */
2284         if (osd_dev(dt->do_lu.lo_dev)->od_fallocate_zero_blocks < 0)
2285                 RETURN(-EOPNOTSUPP);
2286
2287         LASSERT(th);
2288         LASSERT(inode);
2289
2290         if (mode & FALLOC_FL_PUNCH_HOLE) {
2291                 rc = osd_declare_inode_qid(env, i_uid_read(inode),
2292                                            i_gid_read(inode),
2293                                            i_projid_read(inode), 0, oh,
2294                                            osd_dt_obj(dt), NULL, OSD_QID_BLK);
2295                 if (rc == 0)
2296                         rc = osd_trunc_lock(osd_dt_obj(dt), oh, false);
2297                 RETURN(rc);
2298         }
2299
2300         /* quota space for metadata blocks
2301          * approximate metadata estimate should be good enough.
2302          */
2303         quota_space += PAGE_SIZE;
2304         quota_space += depth * LDISKFS_BLOCK_SIZE(osd_sb(osd));
2305
2306         /* quota space should be reported in 1K blocks */
2307         quota_space = toqb(quota_space) + toqb(end - start) +
2308                       LDISKFS_META_TRANS_BLOCKS(inode->i_sb);
2309
2310         /* We don't need to reserve credits for whole fallocate here.
2311          * We reserve space only for metadata. Fallocate credits are
2312          * extended as required
2313          */
2314         rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
2315                                    i_projid_read(inode), quota_space, oh,
2316                                    osd_dt_obj(dt), NULL, OSD_QID_BLK);
2317         RETURN(rc);
2318 }
2319
2320 static int osd_fallocate_preallocate(const struct lu_env *env,
2321                                      struct dt_object *dt,
2322                                      __u64 start, __u64 end, int mode,
2323                                      struct thandle *th)
2324 {
2325         struct osd_thandle *oh = container_of(th, struct osd_thandle, ot_super);
2326         handle_t *handle = ldiskfs_journal_current_handle();
2327         unsigned int save_credits = oh->ot_credits;
2328         struct osd_object *obj = osd_dt_obj(dt);
2329         struct inode *inode = obj->oo_inode;
2330         struct ldiskfs_map_blocks map;
2331         unsigned int credits;
2332         ldiskfs_lblk_t blen;
2333         ldiskfs_lblk_t boff;
2334         loff_t new_size = 0;
2335         int depth = 0;
2336         int flags;
2337         int rc = 0;
2338
2339         ENTRY;
2340
2341         LASSERT(dt_object_exists(dt));
2342         LASSERT(osd_invariant(obj));
2343         LASSERT(inode != NULL);
2344
2345         CDEBUG(D_INODE, "fallocate: inode #%lu: start %llu end %llu mode %d\n",
2346                inode->i_ino, start, end, mode);
2347
2348         dquot_initialize(inode);
2349
2350         LASSERT(th);
2351
2352         boff = start >> inode->i_blkbits;
2353         blen = (ALIGN(end, 1 << inode->i_blkbits) >> inode->i_blkbits) - boff;
2354
2355         /* Create and mark new extents as either zero or unwritten */
2356         flags = (osd_dev(dt->do_lu.lo_dev)->od_fallocate_zero_blocks ||
2357                  !ldiskfs_test_inode_flag(inode, LDISKFS_INODE_EXTENTS)) ?
2358                 LDISKFS_GET_BLOCKS_CREATE_ZERO :
2359                 LDISKFS_GET_BLOCKS_CREATE_UNWRIT_EXT;
2360 #ifndef HAVE_LDISKFS_GET_BLOCKS_KEEP_SIZE
2361         if (mode & FALLOC_FL_KEEP_SIZE)
2362                 flags |= LDISKFS_GET_BLOCKS_KEEP_SIZE;
2363 #endif
2364         inode_lock(inode);
2365
2366         if (!(mode & FALLOC_FL_KEEP_SIZE) && (end > i_size_read(inode) ||
2367             end > LDISKFS_I(inode)->i_disksize)) {
2368                 new_size = end;
2369                 rc = inode_newsize_ok(inode, new_size);
2370                 if (rc)
2371                         GOTO(out, rc);
2372         }
2373
2374         inode_dio_wait(inode);
2375
2376         map.m_lblk = boff;
2377         map.m_len = blen;
2378
2379         /* Don't normalize the request if it can fit in one extent so
2380          * that it doesn't get unnecessarily split into multiple extents.
2381          */
2382         if (blen <= EXT_UNWRITTEN_MAX_LEN)
2383                 flags |= LDISKFS_GET_BLOCKS_NO_NORMALIZE;
2384
2385         /*
2386          * credits to insert 1 extent into extent tree.
2387          */
2388         credits = osd_chunk_trans_blocks(inode, blen);
2389         depth = ext_depth(inode);
2390
2391         while (rc >= 0 && blen) {
2392                 loff_t epos;
2393
2394                 /*
2395                  * Recalculate credits when extent tree depth changes.
2396                  */
2397                 if (depth != ext_depth(inode)) {
2398                         credits = osd_chunk_trans_blocks(inode, blen);
2399                         depth = ext_depth(inode);
2400                 }
2401
2402                 /* TODO: quota check */
2403                 rc = osd_extend_restart_trans(handle, credits, inode);
2404                 if (rc)
2405                         break;
2406
2407                 rc = ldiskfs_map_blocks(handle, inode, &map, flags);
2408                 if (rc <= 0) {
2409                         CDEBUG(D_INODE,
2410                                "inode #%lu: block %u: len %u: ldiskfs_map_blocks returned %d\n",
2411                                inode->i_ino, map.m_lblk, map.m_len, rc);
2412                         ldiskfs_mark_inode_dirty(handle, inode);
2413                         break;
2414                 }
2415
2416                 map.m_lblk += rc;
2417                 map.m_len = blen = blen - rc;
2418                 epos = (loff_t)map.m_lblk << inode->i_blkbits;
2419                 inode->i_ctime = current_time(inode);
2420                 if (new_size) {
2421                         if (epos > end)
2422                                 epos = end;
2423                         if (ldiskfs_update_inode_size(inode, epos) & 0x1)
2424                                 inode->i_mtime = inode->i_ctime;
2425 #ifndef HAVE_LDISKFS_GET_BLOCKS_KEEP_SIZE
2426                 } else {
2427                         if (epos > inode->i_size)
2428                                 ldiskfs_set_inode_flag(inode,
2429                                                        LDISKFS_INODE_EOFBLOCKS);
2430 #endif
2431                 }
2432
2433                 ldiskfs_mark_inode_dirty(handle, inode);
2434         }
2435
2436 out:
2437         /* extand credits if needed for operations such as attribute set */
2438         if (rc >= 0)
2439                 rc = osd_extend_restart_trans(handle, save_credits, inode);
2440
2441         inode_unlock(inode);
2442
2443         RETURN(rc);
2444 }
2445
2446 static int osd_fallocate_punch(const struct lu_env *env, struct dt_object *dt,
2447                                __u64 start, __u64 end, int mode,
2448                                struct thandle *th)
2449 {
2450         struct osd_object *obj = osd_dt_obj(dt);
2451         struct inode *inode = obj->oo_inode;
2452         struct osd_access_lock *al;
2453         struct osd_thandle *oh;
2454         int rc = 0, found = 0;
2455
2456         ENTRY;
2457
2458         LASSERT(dt_object_exists(dt));
2459         LASSERT(osd_invariant(obj));
2460         LASSERT(inode != NULL);
2461
2462         dquot_initialize(inode);
2463
2464         LASSERT(th);
2465         oh = container_of(th, struct osd_thandle, ot_super);
2466         LASSERT(oh->ot_handle->h_transaction != NULL);
2467
2468         list_for_each_entry(al, &oh->ot_trunc_locks, tl_list) {
2469                 if (obj != al->tl_obj)
2470                         continue;
2471                 LASSERT(al->tl_shared == 0);
2472                 found = 1;
2473                 /* do actual punch in osd_trans_stop() */
2474                 al->tl_start = start;
2475                 al->tl_end = end;
2476                 al->tl_mode = mode;
2477                 al->tl_punch = true;
2478                 break;
2479         }
2480
2481         RETURN(rc);
2482 }
2483
2484 static int osd_fallocate(const struct lu_env *env, struct dt_object *dt,
2485                          __u64 start, __u64 end, int mode, struct thandle *th)
2486 {
2487         int rc;
2488
2489         ENTRY;
2490
2491         if (mode & FALLOC_FL_PUNCH_HOLE) {
2492                 /* punch */
2493                 rc = osd_fallocate_punch(env, dt, start, end, mode, th);
2494         } else {
2495                 /* standard preallocate */
2496                 rc = osd_fallocate_preallocate(env, dt, start, end, mode, th);
2497         }
2498         RETURN(rc);
2499 }
2500
2501 static int osd_declare_punch(const struct lu_env *env, struct dt_object *dt,
2502                              __u64 start, __u64 end, struct thandle *th)
2503 {
2504         struct osd_thandle *oh;
2505         struct inode       *inode;
2506         int                 rc;
2507         ENTRY;
2508
2509         LASSERT(th);
2510         oh = container_of(th, struct osd_thandle, ot_super);
2511
2512         /*
2513          * we don't need to reserve credits for whole truncate
2514          * it's not possible as truncate may need to free too many
2515          * blocks and that won't fit a single transaction. instead
2516          * we reserve credits to change i_size and put inode onto
2517          * orphan list. if needed truncate will extend or restart
2518          * transaction
2519          */
2520         osd_trans_declare_op(env, oh, OSD_OT_PUNCH,
2521                              osd_dto_credits_noquota[DTO_ATTR_SET_BASE] + 3);
2522
2523         inode = osd_dt_obj(dt)->oo_inode;
2524         LASSERT(inode);
2525
2526         rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
2527                                    i_projid_read(inode), 0, oh, osd_dt_obj(dt),
2528                                    NULL, OSD_QID_BLK);
2529
2530         if (rc == 0)
2531                 rc = osd_trunc_lock(osd_dt_obj(dt), oh, false);
2532
2533         RETURN(rc);
2534 }
2535
2536 static int osd_punch(const struct lu_env *env, struct dt_object *dt,
2537                      __u64 start, __u64 end, struct thandle *th)
2538 {
2539         struct osd_object *obj = osd_dt_obj(dt);
2540         struct osd_device *osd = osd_obj2dev(obj);
2541         struct inode *inode = obj->oo_inode;
2542         struct osd_access_lock *al;
2543         struct osd_thandle *oh;
2544         int rc = 0, found = 0;
2545         bool grow = false;
2546         ENTRY;
2547
2548         LASSERT(dt_object_exists(dt));
2549         LASSERT(osd_invariant(obj));
2550         LASSERT(inode != NULL);
2551         dquot_initialize(inode);
2552
2553         LASSERT(th);
2554         oh = container_of(th, struct osd_thandle, ot_super);
2555         LASSERT(oh->ot_handle->h_transaction != NULL);
2556
2557         /* we used to skip truncate to current size to
2558          * optimize truncates on OST. with DoM we can
2559          * get attr_set to set specific size (MDS_REINT)
2560          * and then get truncate RPC which essentially
2561          * would be skipped. this is bad.. so, disable
2562          * this optimization on MDS till the client stop
2563          * to sent MDS_REINT (LU-11033) -bzzz
2564          */
2565         if (osd->od_is_ost && i_size_read(inode) == start)
2566                 RETURN(0);
2567
2568         osd_trans_exec_op(env, th, OSD_OT_PUNCH);
2569
2570         spin_lock(&inode->i_lock);
2571         if (i_size_read(inode) < start)
2572                 grow = true;
2573         i_size_write(inode, start);
2574         spin_unlock(&inode->i_lock);
2575         /* if object holds encrypted content, we need to make sure we truncate
2576          * on an encryption unit boundary, or subsequent reads will get
2577          * corrupted content
2578          */
2579         if (obj->oo_lma_flags & LUSTRE_ENCRYPT_FL &&
2580             start & ~LUSTRE_ENCRYPTION_MASK)
2581                 start = (start & LUSTRE_ENCRYPTION_MASK) +
2582                         LUSTRE_ENCRYPTION_UNIT_SIZE;
2583         ll_truncate_pagecache(inode, start);
2584
2585         /* optimize grow case */
2586         if (grow) {
2587                 osd_execute_truncate(obj);
2588                 GOTO(out, rc);
2589         }
2590
2591         inode_lock(inode);
2592         /* add to orphan list to ensure truncate completion
2593          * if this transaction succeed. ldiskfs_truncate()
2594          * will take the inode out of the list
2595          */
2596         rc = ldiskfs_orphan_add(oh->ot_handle, inode);
2597         inode_unlock(inode);
2598         if (rc != 0)
2599                 GOTO(out, rc);
2600
2601         list_for_each_entry(al, &oh->ot_trunc_locks, tl_list) {
2602                 if (obj != al->tl_obj)
2603                         continue;
2604                 LASSERT(al->tl_shared == 0);
2605                 found = 1;
2606                 /* do actual truncate in osd_trans_stop() */
2607                 al->tl_truncate = 1;
2608                 break;
2609         }
2610         LASSERT(found);
2611
2612 out:
2613         RETURN(rc);
2614 }
2615
2616 static int fiemap_check_ranges(struct inode *inode,
2617                                u64 start, u64 len, u64 *new_len)
2618 {
2619         loff_t maxbytes;
2620
2621         *new_len = len;
2622
2623         if (len == 0)
2624                 return -EINVAL;
2625
2626         if (ldiskfs_test_inode_flag(inode, LDISKFS_INODE_EXTENTS))
2627                 maxbytes = inode->i_sb->s_maxbytes;
2628         else
2629                 maxbytes = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes;
2630
2631         if (start > maxbytes)
2632                 return -EFBIG;
2633
2634         /*
2635          * Shrink request scope to what the fs can actually handle.
2636          */
2637         if (len > maxbytes || (maxbytes - len) < start)
2638                 *new_len = maxbytes - start;
2639
2640         return 0;
2641 }
2642
2643 /* So that the fiemap access checks can't overflow on 32 bit machines. */
2644 #define FIEMAP_MAX_EXTENTS     (UINT_MAX / sizeof(struct fiemap_extent))
2645
2646 static int osd_fiemap_get(const struct lu_env *env, struct dt_object *dt,
2647                           struct fiemap *fm)
2648 {
2649         struct fiemap_extent_info fieinfo = {0, };
2650         struct inode *inode = osd_dt_obj(dt)->oo_inode;
2651         u64 len;
2652         int rc;
2653
2654         LASSERT(inode);
2655         if (inode->i_op->fiemap == NULL)
2656                 return -EOPNOTSUPP;
2657
2658         if (fm->fm_extent_count > FIEMAP_MAX_EXTENTS)
2659                 return -EINVAL;
2660
2661         rc = fiemap_check_ranges(inode, fm->fm_start, fm->fm_length, &len);
2662         if (rc)
2663                 return rc;
2664
2665         fieinfo.fi_flags = fm->fm_flags;
2666         fieinfo.fi_extents_max = fm->fm_extent_count;
2667         fieinfo.fi_extents_start = fm->fm_extents;
2668
2669         if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
2670                 filemap_write_and_wait(inode->i_mapping);
2671
2672         rc = inode->i_op->fiemap(inode, &fieinfo, fm->fm_start, len);
2673         fm->fm_flags = fieinfo.fi_flags;
2674         fm->fm_mapped_extents = fieinfo.fi_extents_mapped;
2675
2676         return rc;
2677 }
2678
2679 static int osd_ladvise(const struct lu_env *env, struct dt_object *dt,
2680                        __u64 start, __u64 end, enum lu_ladvise_type advice)
2681 {
2682         struct osd_object *obj = osd_dt_obj(dt);
2683         int rc = 0;
2684         ENTRY;
2685
2686         switch (advice) {
2687         case LU_LADVISE_DONTNEED:
2688                 if (end)
2689                         invalidate_mapping_pages(obj->oo_inode->i_mapping,
2690                                                  start >> PAGE_SHIFT,
2691                                                  (end - 1) >> PAGE_SHIFT);
2692                 break;
2693         default:
2694                 rc = -ENOTSUPP;
2695                 break;
2696         }
2697
2698         RETURN(rc);
2699 }
2700
2701 static loff_t osd_lseek(const struct lu_env *env, struct dt_object *dt,
2702                         loff_t offset, int whence)
2703 {
2704         struct osd_object *obj = osd_dt_obj(dt);
2705         struct osd_device *dev = osd_obj2dev(obj);
2706         struct inode *inode = obj->oo_inode;
2707         struct file *file;
2708         loff_t result;
2709
2710         ENTRY;
2711         LASSERT(dt_object_exists(dt));
2712         LASSERT(osd_invariant(obj));
2713         LASSERT(inode);
2714         LASSERT(offset >= 0);
2715
2716         file = alloc_file_pseudo(inode, dev->od_mnt, "/", O_NOATIME,
2717                                  inode->i_fop);
2718         if (IS_ERR(file))
2719                 RETURN(PTR_ERR(file));
2720
2721         file->f_mode |= FMODE_64BITHASH;
2722         result = file->f_op->llseek(file, offset, whence);
2723         ihold(inode);
2724         fput(file);
2725         /*
2726          * If 'offset' is beyond end of object file then treat it as not error
2727          * but valid case for SEEK_HOLE and return 'offset' as result.
2728          * LOV will decide if it is beyond real end of file or not.
2729          */
2730         if (whence == SEEK_HOLE && result == -ENXIO)
2731                 result = offset;
2732
2733         CDEBUG(D_INFO, "seek %s from %lld: %lld\n", whence == SEEK_HOLE ?
2734                        "hole" : "data", offset, result);
2735         RETURN(result);
2736 }
2737
2738 /*
2739  * in some cases we may need declare methods for objects being created
2740  * e.g., when we create symlink
2741  */
2742 const struct dt_body_operations osd_body_ops_new = {
2743         .dbo_declare_write = osd_declare_write,
2744 };
2745
2746 const struct dt_body_operations osd_body_ops = {
2747         .dbo_read                       = osd_read,
2748         .dbo_declare_write              = osd_declare_write,
2749         .dbo_write                      = osd_write,
2750         .dbo_bufs_get                   = osd_bufs_get,
2751         .dbo_bufs_put                   = osd_bufs_put,
2752         .dbo_write_prep                 = osd_write_prep,
2753         .dbo_declare_write_commit       = osd_declare_write_commit,
2754         .dbo_write_commit               = osd_write_commit,
2755         .dbo_read_prep                  = osd_read_prep,
2756         .dbo_declare_punch              = osd_declare_punch,
2757         .dbo_punch                      = osd_punch,
2758         .dbo_fiemap_get                 = osd_fiemap_get,
2759         .dbo_ladvise                    = osd_ladvise,
2760         .dbo_declare_fallocate          = osd_declare_fallocate,
2761         .dbo_fallocate                  = osd_fallocate,
2762         .dbo_lseek                      = osd_lseek,
2763 };
2764
2765 /**
2766  * Get a truncate lock
2767  *
2768  * In order to take multi-transaction truncate out of main transaction we let
2769  * the caller grab a lock on the object passed. the lock can be shared (for
2770  * writes) and exclusive (for truncate). It's not allowed to mix truncate
2771  * and write in the same transaction handle (do not confuse with big ldiskfs
2772  * transaction containing lots of handles).
2773  * The lock must be taken at declaration.
2774  *
2775  * \param obj           object to lock
2776  * \oh                  transaction
2777  * \shared              shared or exclusive
2778  *
2779  * \retval 0            lock is granted
2780  * \retval -NOMEM       no memory to allocate lock
2781  */
2782 int osd_trunc_lock(struct osd_object *obj, struct osd_thandle *oh, bool shared)
2783 {
2784         struct osd_access_lock *al, *tmp;
2785
2786         LASSERT(obj);
2787         LASSERT(oh);
2788
2789         list_for_each_entry(tmp, &oh->ot_trunc_locks, tl_list) {
2790                 if (tmp->tl_obj != obj)
2791                         continue;
2792                 LASSERT(tmp->tl_shared == shared);
2793                 /* found same lock */
2794                 return 0;
2795         }
2796
2797         OBD_ALLOC_PTR(al);
2798         if (unlikely(al == NULL))
2799                 return -ENOMEM;
2800         al->tl_obj = obj;
2801         al->tl_truncate = false;
2802         if (shared)
2803                 down_read(&obj->oo_ext_idx_sem);
2804         else
2805                 down_write(&obj->oo_ext_idx_sem);
2806         al->tl_shared = shared;
2807         lu_object_get(&obj->oo_dt.do_lu);
2808
2809         list_add(&al->tl_list, &oh->ot_trunc_locks);
2810
2811         return 0;
2812 }
2813
2814 void osd_trunc_unlock_all(const struct lu_env *env, struct list_head *list)
2815 {
2816         struct osd_access_lock *al, *tmp;
2817
2818         list_for_each_entry_safe(al, tmp, list, tl_list) {
2819                 if (al->tl_shared)
2820                         up_read(&al->tl_obj->oo_ext_idx_sem);
2821                 else
2822                         up_write(&al->tl_obj->oo_ext_idx_sem);
2823                 osd_object_put(env, al->tl_obj);
2824                 list_del(&al->tl_list);
2825                 OBD_FREE_PTR(al);
2826         }
2827 }
2828
2829 /* For a partial-page punch, flush punch range to disk immediately */
2830 static void osd_partial_page_flush_punch(struct osd_device *d,
2831                                          struct inode *inode, loff_t start,
2832                                          loff_t end)
2833 {
2834         if (osd_use_page_cache(d)) {
2835                 filemap_fdatawrite_range(inode->i_mapping, start, end);
2836         } else {
2837                 /* Notice we use "wait" version to ensure I/O is complete */
2838                 filemap_write_and_wait_range(inode->i_mapping, start,
2839                                              end);
2840                 invalidate_mapping_pages(inode->i_mapping, start >> PAGE_SHIFT,
2841                                          end >> PAGE_SHIFT);
2842         }
2843 }
2844
2845 /*
2846  * For a partial-page truncate, flush the page to disk immediately to
2847  * avoid data corruption during direct disk write.  b=17397
2848  */
2849 static void osd_partial_page_flush(struct osd_device *d, struct inode *inode,
2850                                    loff_t offset)
2851 {
2852         if (!(offset & ~PAGE_MASK))
2853                 return;
2854
2855         if (osd_use_page_cache(d)) {
2856                 filemap_fdatawrite_range(inode->i_mapping, offset, offset + 1);
2857         } else {
2858                 /* Notice we use "wait" version to ensure I/O is complete */
2859                 filemap_write_and_wait_range(inode->i_mapping, offset,
2860                                              offset + 1);
2861                 invalidate_mapping_pages(inode->i_mapping, offset >> PAGE_SHIFT,
2862                                          offset >> PAGE_SHIFT);
2863         }
2864 }
2865
2866 void osd_execute_truncate(struct osd_object *obj)
2867 {
2868         struct osd_device *d = osd_obj2dev(obj);
2869         struct inode *inode = obj->oo_inode;
2870         __u64 size;
2871
2872         /* simulate crash before (in the middle) of delayed truncate */
2873         if (OBD_FAIL_CHECK(OBD_FAIL_OSD_FAIL_AT_TRUNCATE)) {
2874                 struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
2875                 struct ldiskfs_sb_info *sbi = LDISKFS_SB(inode->i_sb);
2876
2877                 mutex_lock(&sbi->s_orphan_lock);
2878                 list_del_init(&ei->i_orphan);
2879                 mutex_unlock(&sbi->s_orphan_lock);
2880                 return;
2881         }
2882
2883         size = i_size_read(inode);
2884         inode_lock(inode);
2885         /* if object holds encrypted content, we need to make sure we truncate
2886          * on an encryption unit boundary, or block content will get corrupted
2887          */
2888         if (obj->oo_lma_flags & LUSTRE_ENCRYPT_FL &&
2889             size & ~LUSTRE_ENCRYPTION_MASK)
2890                 inode->i_size = (size & LUSTRE_ENCRYPTION_MASK) +
2891                         LUSTRE_ENCRYPTION_UNIT_SIZE;
2892         ldiskfs_truncate(inode);
2893         inode_unlock(inode);
2894         if (inode->i_size != size) {
2895                 spin_lock(&inode->i_lock);
2896                 i_size_write(inode, size);
2897                 LDISKFS_I(inode)->i_disksize = size;
2898                 spin_unlock(&inode->i_lock);
2899                 osd_dirty_inode(inode, I_DIRTY_DATASYNC);
2900         }
2901         osd_partial_page_flush(d, inode, size);
2902 }
2903
2904 static int osd_execute_punch(const struct lu_env *env, struct osd_object *obj,
2905                              loff_t start, loff_t end, int mode)
2906 {
2907         struct osd_device *d = osd_obj2dev(obj);
2908         struct inode *inode = obj->oo_inode;
2909         struct file *file;
2910         int rc;
2911
2912         file = alloc_file_pseudo(inode, d->od_mnt, "/", O_NOATIME,
2913                                  inode->i_fop);
2914         if (IS_ERR(file))
2915                 RETURN(PTR_ERR(file));
2916
2917         file->f_mode |= FMODE_64BITHASH;
2918         rc = file->f_op->fallocate(file, mode, start, end - start);
2919         ihold(inode);
2920         fput(file);
2921         if (rc == 0)
2922                 osd_partial_page_flush_punch(d, inode, start, end - 1);
2923         return rc;
2924 }
2925
2926 int osd_process_truncates(const struct lu_env *env, struct list_head *list)
2927 {
2928         struct osd_access_lock *al;
2929         int rc = 0;
2930
2931         LASSERT(!journal_current_handle());
2932
2933         list_for_each_entry(al, list, tl_list) {
2934                 if (al->tl_shared)
2935                         continue;
2936                 if (al->tl_truncate)
2937                         osd_execute_truncate(al->tl_obj);
2938                 else if (al->tl_punch)
2939                         rc = osd_execute_punch(env, al->tl_obj, al->tl_start,
2940                                                al->tl_end, al->tl_mode);
2941         }
2942
2943         return rc;
2944 }