fs/gfs2/aops.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
   5  */
   6
   7 #include <linux/sched.h>
   8 #include <linux/slab.h>
   9 #include <linux/spinlock.h>
  10 #include <linux/completion.h>
  11 #include <linux/buffer_head.h>
  12 #include <linux/pagemap.h>
  13 #include <linux/pagevec.h>
  14 #include <linux/mpage.h>
  15 #include <linux/fs.h>
  16 #include <linux/writeback.h>
  17 #include <linux/swap.h>
  18 #include <linux/gfs2_ondisk.h>
  19 #include <linux/backing-dev.h>
  20 #include <linux/uio.h>
  21 #include <trace/events/writeback.h>
  22 #include <linux/sched/signal.h>
  23
  24 #include "gfs2.h"
  25 #include "incore.h"
  26 #include "bmap.h"
  27 #include "glock.h"
  28 #include "inode.h"
  29 #include "log.h"
  30 #include "meta_io.h"
  31 #include "quota.h"
  32 #include "trans.h"
  33 #include "rgrp.h"
  34 #include "super.h"
  35 #include "util.h"
  36 #include "glops.h"
  37 #include "aops.h"
  38
  39
  40 void gfs2_trans_add_databufs(struct gfs2_inode *ip, struct folio *folio,
  41                              size_t from, size_t len)
  42 {
  43         struct buffer_head *head = folio_buffers(folio);
  44         unsigned int bsize = head->b_size;
  45         struct buffer_head *bh;
  46         size_t to = from + len;
  47         size_t start, end;
  48
  49         for (bh = head, start = 0; bh != head || !start;
  50              bh = bh->b_this_page, start = end) {
  51                 end = start + bsize;
  52                 if (end <= from)
  53                         continue;
  54                 if (start >= to)
  55                         break;
  56                 set_buffer_uptodate(bh);
  57                 gfs2_trans_add_data(ip->i_gl, bh);
  58         }
  59 }
  60
  61 /**
  62  * gfs2_get_block_noalloc - Fills in a buffer head with details about a block
  63  * @inode: The inode
  64  * @lblock: The block number to look up
  65  * @bh_result: The buffer head to return the result in
  66  * @create: Non-zero if we may add block to the file
  67  *
  68  * Returns: errno
  69  */
  70
  71 static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock,
  72                                   struct buffer_head *bh_result, int create)
  73 {
  74         int error;
  75
  76         error = gfs2_block_map(inode, lblock, bh_result, 0);
  77         if (error)
  78                 return error;
  79         if (!buffer_mapped(bh_result))
  80                 return -ENODATA;
  81         return 0;
  82 }
  83
  84 /**
  85  * gfs2_write_jdata_folio - gfs2 jdata-specific version of block_write_full_folio
  86  * @folio: The folio to write
  87  * @wbc: The writeback control
  88  *
  89  * This is the same as calling block_write_full_folio, but it also
  90  * writes pages outside of i_size
  91  */
  92 static int gfs2_write_jdata_folio(struct folio *folio,
  93                                  struct writeback_control *wbc)
  94 {
  95         struct inode * const inode = folio->mapping->host;
  96         loff_t i_size = i_size_read(inode);
  97
  98         /*
  99          * The folio straddles i_size.  It must be zeroed out on each and every
 100          * writepage invocation because it may be mmapped.  "A file is mapped
 101          * in multiples of the page size.  For a file that is not a multiple of
 102          * the page size, the remaining memory is zeroed when mapped, and
 103          * writes to that region are not written out to the file."
 104          */
 105         if (folio_pos(folio) < i_size &&
 106             i_size < folio_pos(folio) + folio_size(folio))
 107                 folio_zero_segment(folio, offset_in_folio(folio, i_size),
 108                                 folio_size(folio));
 109
 110         return __block_write_full_folio(inode, folio, gfs2_get_block_noalloc,
 111                         wbc);
 112 }
 113
 114 /**
 115  * __gfs2_jdata_write_folio - The core of jdata writepage
 116  * @folio: The folio to write
 117  * @wbc: The writeback control
 118  *
 119  * Implements the core of write back. If a transaction is required then
 120  * the checked flag will have been set and the transaction will have
 121  * already been started before this is called.
 122  */
 123 static int __gfs2_jdata_write_folio(struct folio *folio,
 124                 struct writeback_control *wbc)
 125 {
 126         struct inode *inode = folio->mapping->host;
 127         struct gfs2_inode *ip = GFS2_I(inode);
 128
 129         if (folio_test_checked(folio)) {
 130                 folio_clear_checked(folio);
 131                 if (!folio_buffers(folio)) {
 132                         create_empty_buffers(folio,
 133                                         inode->i_sb->s_blocksize,
 134                                         BIT(BH_Dirty)|BIT(BH_Uptodate));
 135                 }
 136                 gfs2_trans_add_databufs(ip, folio, 0, folio_size(folio));
 137         }
 138         return gfs2_write_jdata_folio(folio, wbc);
 139 }
 140
 141 /**
 142  * gfs2_writepages - Write a bunch of dirty pages back to disk
 143  * @mapping: The mapping to write
 144  * @wbc: Write-back control
 145  *
 146  * Used for both ordered and writeback modes.
 147  */
 148 static int gfs2_writepages(struct address_space *mapping,
 149                            struct writeback_control *wbc)
 150 {
 151         struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
 152         struct iomap_writepage_ctx wpc = { };
 153         int ret;
 154
 155         /*
 156          * Even if we didn't write enough pages here, we might still be holding
 157          * dirty pages in the ail. We forcibly flush the ail because we don't
 158          * want balance_dirty_pages() to loop indefinitely trying to write out
 159          * pages held in the ail that it can't find.
 160          */
 161         ret = iomap_writepages(mapping, wbc, &wpc, &gfs2_writeback_ops);
 162         if (ret == 0 && wbc->nr_to_write > 0)
 163                 set_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags);
 164         return ret;
 165 }
 166
 167 /**
 168  * gfs2_write_jdata_batch - Write back a folio batch's worth of folios
 169  * @mapping: The mapping
 170  * @wbc: The writeback control
 171  * @fbatch: The batch of folios
 172  * @done_index: Page index
 173  *
 174  * Returns: non-zero if loop should terminate, zero otherwise
 175  */
 176
 177 static int gfs2_write_jdata_batch(struct address_space *mapping,
 178                                     struct writeback_control *wbc,
 179                                     struct folio_batch *fbatch,
 180                                     pgoff_t *done_index)
 181 {
 182         struct inode *inode = mapping->host;
 183         struct gfs2_sbd *sdp = GFS2_SB(inode);
 184         unsigned nrblocks;
 185         int i;
 186         int ret;
 187         size_t size = 0;
 188         int nr_folios = folio_batch_count(fbatch);
 189
 190         for (i = 0; i < nr_folios; i++)
 191                 size += folio_size(fbatch->folios[i]);
 192         nrblocks = size >> inode->i_blkbits;
 193
 194         ret = gfs2_trans_begin(sdp, nrblocks, nrblocks);
 195         if (ret < 0)
 196                 return ret;
 197
 198         for (i = 0; i < nr_folios; i++) {
 199                 struct folio *folio = fbatch->folios[i];
 200
 201                 *done_index = folio->index;
 202
 203                 folio_lock(folio);
 204
 205                 if (unlikely(folio->mapping != mapping)) {
 206 continue_unlock:
 207                         folio_unlock(folio);
 208                         continue;
 209                 }
 210
 211                 if (!folio_test_dirty(folio)) {
 212                         /* someone wrote it for us */
 213                         goto continue_unlock;
 214                 }
 215
 216                 if (folio_test_writeback(folio)) {
 217                         if (wbc->sync_mode != WB_SYNC_NONE)
 218                                 folio_wait_writeback(folio);
 219                         else
 220                                 goto continue_unlock;
 221                 }
 222
 223                 BUG_ON(folio_test_writeback(folio));
 224                 if (!folio_clear_dirty_for_io(folio))
 225                         goto continue_unlock;
 226
 227                 trace_wbc_writepage(wbc, inode_to_bdi(inode));
 228
 229                 ret = __gfs2_jdata_write_folio(folio, wbc);
 230                 if (unlikely(ret)) {
 231                         if (ret == AOP_WRITEPAGE_ACTIVATE) {
 232                                 folio_unlock(folio);
 233                                 ret = 0;
 234                         } else {
 235
 236                                 /*
 237                                  * done_index is set past this page,
 238                                  * so media errors will not choke
 239                                  * background writeout for the entire
 240                                  * file. This has consequences for
 241                                  * range_cyclic semantics (ie. it may
 242                                  * not be suitable for data integrity
 243                                  * writeout).
 244                                  */
 245                                 *done_index = folio_next_index(folio);
 246                                 ret = 1;
 247                                 break;
 248                         }
 249                 }
 250
 251                 /*
 252                  * We stop writing back only if we are not doing
 253                  * integrity sync. In case of integrity sync we have to
 254                  * keep going until we have written all the pages
 255                  * we tagged for writeback prior to entering this loop.
 256                  */
 257                 if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) {
 258                         ret = 1;
 259                         break;
 260                 }
 261
 262         }
 263         gfs2_trans_end(sdp);
 264         return ret;
 265 }
 266
 267 /**
 268  * gfs2_write_cache_jdata - Like write_cache_pages but different
 269  * @mapping: The mapping to write
 270  * @wbc: The writeback control
 271  *
 272  * The reason that we use our own function here is that we need to
 273  * start transactions before we grab page locks. This allows us
 274  * to get the ordering right.
 275  */
 276
 277 static int gfs2_write_cache_jdata(struct address_space *mapping,
 278                                   struct writeback_control *wbc)
 279 {
 280         int ret = 0;
 281         int done = 0;
 282         struct folio_batch fbatch;
 283         int nr_folios;
 284         pgoff_t writeback_index;
 285         pgoff_t index;
 286         pgoff_t end;
 287         pgoff_t done_index;
 288         int cycled;
 289         int range_whole = 0;
 290         xa_mark_t tag;
 291
 292         folio_batch_init(&fbatch);
 293         if (wbc->range_cyclic) {
 294                 writeback_index = mapping->writeback_index; /* prev offset */
 295                 index = writeback_index;
 296                 if (index == 0)
 297                         cycled = 1;
 298                 else
 299                         cycled = 0;
 300                 end = -1;
 301         } else {
 302                 index = wbc->range_start >> PAGE_SHIFT;
 303                 end = wbc->range_end >> PAGE_SHIFT;
 304                 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
 305                         range_whole = 1;
 306                 cycled = 1; /* ignore range_cyclic tests */
 307         }
 308         if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
 309                 tag = PAGECACHE_TAG_TOWRITE;
 310         else
 311                 tag = PAGECACHE_TAG_DIRTY;
 312
 313 retry:
 314         if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
 315                 tag_pages_for_writeback(mapping, index, end);
 316         done_index = index;
 317         while (!done && (index <= end)) {
 318                 nr_folios = filemap_get_folios_tag(mapping, &index, end,
 319                                 tag, &fbatch);
 320                 if (nr_folios == 0)
 321                         break;
 322
 323                 ret = gfs2_write_jdata_batch(mapping, wbc, &fbatch,
 324                                 &done_index);
 325                 if (ret)
 326                         done = 1;
 327                 if (ret > 0)
 328                         ret = 0;
 329                 folio_batch_release(&fbatch);
 330                 cond_resched();
 331         }
 332
 333         if (!cycled && !done) {
 334                 /*
 335                  * range_cyclic:
 336                  * We hit the last page and there is more work to be done: wrap
 337                  * back to the start of the file
 338                  */
 339                 cycled = 1;
 340                 index = 0;
 341                 end = writeback_index - 1;
 342                 goto retry;
 343         }
 344
 345         if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
 346                 mapping->writeback_index = done_index;
 347
 348         return ret;
 349 }
 350
 351
 352 /**
 353  * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk
 354  * @mapping: The mapping to write
 355  * @wbc: The writeback control
 356  *
 357  */
 358
 359 static int gfs2_jdata_writepages(struct address_space *mapping,
 360                                  struct writeback_control *wbc)
 361 {
 362         struct gfs2_inode *ip = GFS2_I(mapping->host);
 363         struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
 364         int ret;
 365
 366         ret = gfs2_write_cache_jdata(mapping, wbc);
 367         if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) {
 368                 gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
 369                                GFS2_LFC_JDATA_WPAGES);
 370                 ret = gfs2_write_cache_jdata(mapping, wbc);
 371         }
 372         return ret;
 373 }
 374
 375 /**
 376  * stuffed_read_folio - Fill in a Linux folio with stuffed file data
 377  * @ip: the inode
 378  * @folio: the folio
 379  *
 380  * Returns: errno
 381  */
 382 static int stuffed_read_folio(struct gfs2_inode *ip, struct folio *folio)
 383 {
 384         struct buffer_head *dibh = NULL;
 385         size_t dsize = i_size_read(&ip->i_inode);
 386         void *from = NULL;
 387         int error = 0;
 388
 389         /*
 390          * Due to the order of unstuffing files and ->fault(), we can be
 391          * asked for a zero folio in the case of a stuffed file being extended,
 392          * so we need to supply one here. It doesn't happen often.
 393          */
 394         if (unlikely(folio->index)) {
 395                 dsize = 0;
 396         } else {
 397                 error = gfs2_meta_inode_buffer(ip, &dibh);
 398                 if (error)
 399                         goto out;
 400                 from = dibh->b_data + sizeof(struct gfs2_dinode);
 401         }
 402
 403         folio_fill_tail(folio, 0, from, dsize);
 404         brelse(dibh);
 405 out:
 406         folio_end_read(folio, error == 0);
 407
 408         return error;
 409 }
 410
 411 /**
 412  * gfs2_read_folio - read a folio from a file
 413  * @file: The file to read
 414  * @folio: The folio in the file
 415  */
 416 static int gfs2_read_folio(struct file *file, struct folio *folio)
 417 {
 418         struct inode *inode = folio->mapping->host;
 419         struct gfs2_inode *ip = GFS2_I(inode);
 420         struct gfs2_sbd *sdp = GFS2_SB(inode);
 421         int error;
 422
 423         if (!gfs2_is_jdata(ip) ||
 424             (i_blocksize(inode) == PAGE_SIZE && !folio_buffers(folio))) {
 425                 error = iomap_read_folio(folio, &gfs2_iomap_ops);
 426         } else if (gfs2_is_stuffed(ip)) {
 427                 error = stuffed_read_folio(ip, folio);
 428         } else {
 429                 error = mpage_read_folio(folio, gfs2_block_map);
 430         }
 431
 432         if (gfs2_withdrawing_or_withdrawn(sdp))
 433                 return -EIO;
 434
 435         return error;
 436 }
 437
 438 /**
 439  * gfs2_internal_read - read an internal file
 440  * @ip: The gfs2 inode
 441  * @buf: The buffer to fill
 442  * @pos: The file position
 443  * @size: The amount to read
 444  *
 445  */
 446
 447 ssize_t gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos,
 448                            size_t size)
 449 {
 450         struct address_space *mapping = ip->i_inode.i_mapping;
 451         unsigned long index = *pos >> PAGE_SHIFT;
 452         size_t copied = 0;
 453
 454         do {
 455                 size_t offset, chunk;
 456                 struct folio *folio;
 457
 458                 folio = read_cache_folio(mapping, index, gfs2_read_folio, NULL);
 459                 if (IS_ERR(folio)) {
 460                         if (PTR_ERR(folio) == -EINTR)
 461                                 continue;
 462                         return PTR_ERR(folio);
 463                 }
 464                 offset = *pos + copied - folio_pos(folio);
 465                 chunk = min(size - copied, folio_size(folio) - offset);
 466                 memcpy_from_folio(buf + copied, folio, offset, chunk);
 467                 index = folio_next_index(folio);
 468                 folio_put(folio);
 469                 copied += chunk;
 470         } while(copied < size);
 471         (*pos) += size;
 472         return size;
 473 }
 474
 475 /**
 476  * gfs2_readahead - Read a bunch of pages at once
 477  * @rac: Read-ahead control structure
 478  *
 479  * Some notes:
 480  * 1. This is only for readahead, so we can simply ignore any things
 481  *    which are slightly inconvenient (such as locking conflicts between
 482  *    the page lock and the glock) and return having done no I/O. Its
 483  *    obviously not something we'd want to do on too regular a basis.
 484  *    Any I/O we ignore at this time will be done via readpage later.
 485  * 2. We don't handle stuffed files here we let readpage do the honours.
 486  * 3. mpage_readahead() does most of the heavy lifting in the common case.
 487  * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places.
 488  */
 489
 490 static void gfs2_readahead(struct readahead_control *rac)
 491 {
 492         struct inode *inode = rac->mapping->host;
 493         struct gfs2_inode *ip = GFS2_I(inode);
 494
 495         if (gfs2_is_stuffed(ip))
 496                 ;
 497         else if (gfs2_is_jdata(ip))
 498                 mpage_readahead(rac, gfs2_block_map);
 499         else
 500                 iomap_readahead(rac, &gfs2_iomap_ops);
 501 }
 502
 503 /**
 504  * adjust_fs_space - Adjusts the free space available due to gfs2_grow
 505  * @inode: the rindex inode
 506  */
 507 void adjust_fs_space(struct inode *inode)
 508 {
 509         struct gfs2_sbd *sdp = GFS2_SB(inode);
 510         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 511         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 512         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 513         struct buffer_head *m_bh;
 514         u64 fs_total, new_free;
 515
 516         if (gfs2_trans_begin(sdp, 2 * RES_STATFS, 0) != 0)
 517                 return;
 518
 519         /* Total up the file system space, according to the latest rindex. */
 520         fs_total = gfs2_ri_total(sdp);
 521         if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0)
 522                 goto out;
 523
 524         spin_lock(&sdp->sd_statfs_spin);
 525         gfs2_statfs_change_in(m_sc, m_bh->b_data +
 526                               sizeof(struct gfs2_dinode));
 527         if (fs_total > (m_sc->sc_total + l_sc->sc_total))
 528                 new_free = fs_total - (m_sc->sc_total + l_sc->sc_total);
 529         else
 530                 new_free = 0;
 531         spin_unlock(&sdp->sd_statfs_spin);
 532         fs_warn(sdp, "File system extended by %llu blocks.\n",
 533                 (unsigned long long)new_free);
 534         gfs2_statfs_change(sdp, new_free, new_free, 0);
 535
 536         update_statfs(sdp, m_bh);
 537         brelse(m_bh);
 538 out:
 539         sdp->sd_rindex_uptodate = 0;
 540         gfs2_trans_end(sdp);
 541 }
 542
 543 static bool jdata_dirty_folio(struct address_space *mapping,
 544                 struct folio *folio)
 545 {
 546         if (current->journal_info)
 547                 folio_set_checked(folio);
 548         return block_dirty_folio(mapping, folio);
 549 }
 550
 551 /**
 552  * gfs2_bmap - Block map function
 553  * @mapping: Address space info
 554  * @lblock: The block to map
 555  *
 556  * Returns: The disk address for the block or 0 on hole or error
 557  */
 558
 559 static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
 560 {
 561         struct gfs2_inode *ip = GFS2_I(mapping->host);
 562         struct gfs2_holder i_gh;
 563         sector_t dblock = 0;
 564         int error;
 565
 566         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 567         if (error)
 568                 return 0;
 569
 570         if (!gfs2_is_stuffed(ip))
 571                 dblock = iomap_bmap(mapping, lblock, &gfs2_iomap_ops);
 572
 573         gfs2_glock_dq_uninit(&i_gh);
 574
 575         return dblock;
 576 }
 577
 578 static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh)
 579 {
 580         struct gfs2_bufdata *bd;
 581
 582         lock_buffer(bh);
 583         gfs2_log_lock(sdp);
 584         clear_buffer_dirty(bh);
 585         bd = bh->b_private;
 586         if (bd) {
 587                 if (!list_empty(&bd->bd_list) && !buffer_pinned(bh))
 588                         list_del_init(&bd->bd_list);
 589                 else {
 590                         spin_lock(&sdp->sd_ail_lock);
 591                         gfs2_remove_from_journal(bh, REMOVE_JDATA);
 592                         spin_unlock(&sdp->sd_ail_lock);
 593                 }
 594         }
 595         bh->b_bdev = NULL;
 596         clear_buffer_mapped(bh);
 597         clear_buffer_req(bh);
 598         clear_buffer_new(bh);
 599         gfs2_log_unlock(sdp);
 600         unlock_buffer(bh);
 601 }
 602
 603 static void gfs2_invalidate_folio(struct folio *folio, size_t offset,
 604                                 size_t length)
 605 {
 606         struct gfs2_sbd *sdp = GFS2_SB(folio->mapping->host);
 607         size_t stop = offset + length;
 608         int partial_page = (offset || length < folio_size(folio));
 609         struct buffer_head *bh, *head;
 610         unsigned long pos = 0;
 611
 612         BUG_ON(!folio_test_locked(folio));
 613         if (!partial_page)
 614                 folio_clear_checked(folio);
 615         head = folio_buffers(folio);
 616         if (!head)
 617                 goto out;
 618
 619         bh = head;
 620         do {
 621                 if (pos + bh->b_size > stop)
 622                         return;
 623
 624                 if (offset <= pos)
 625                         gfs2_discard(sdp, bh);
 626                 pos += bh->b_size;
 627                 bh = bh->b_this_page;
 628         } while (bh != head);
 629 out:
 630         if (!partial_page)
 631                 filemap_release_folio(folio, 0);
 632 }
 633
 634 /**
 635  * gfs2_release_folio - free the metadata associated with a folio
 636  * @folio: the folio that's being released
 637  * @gfp_mask: passed from Linux VFS, ignored by us
 638  *
 639  * Calls try_to_free_buffers() to free the buffers and put the folio if the
 640  * buffers can be released.
 641  *
 642  * Returns: true if the folio was put or else false
 643  */
 644
 645 bool gfs2_release_folio(struct folio *folio, gfp_t gfp_mask)
 646 {
 647         struct address_space *mapping = folio->mapping;
 648         struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
 649         struct buffer_head *bh, *head;
 650         struct gfs2_bufdata *bd;
 651
 652         head = folio_buffers(folio);
 653         if (!head)
 654                 return false;
 655
 656         /*
 657          * mm accommodates an old ext3 case where clean folios might
 658          * not have had the dirty bit cleared.  Thus, it can send actual
 659          * dirty folios to ->release_folio() via shrink_active_list().
 660          *
 661          * As a workaround, we skip folios that contain dirty buffers
 662          * below.  Once ->release_folio isn't called on dirty folios
 663          * anymore, we can warn on dirty buffers like we used to here
 664          * again.
 665          */
 666
 667         gfs2_log_lock(sdp);
 668         bh = head;
 669         do {
 670                 if (atomic_read(&bh->b_count))
 671                         goto cannot_release;
 672                 bd = bh->b_private;
 673                 if (bd && bd->bd_tr)
 674                         goto cannot_release;
 675                 if (buffer_dirty(bh) || WARN_ON(buffer_pinned(bh)))
 676                         goto cannot_release;
 677                 bh = bh->b_this_page;
 678         } while (bh != head);
 679
 680         bh = head;
 681         do {
 682                 bd = bh->b_private;
 683                 if (bd) {
 684                         gfs2_assert_warn(sdp, bd->bd_bh == bh);
 685                         bd->bd_bh = NULL;
 686                         bh->b_private = NULL;
 687                         /*
 688                          * The bd may still be queued as a revoke, in which
 689                          * case we must not dequeue nor free it.
 690                          */
 691                         if (!bd->bd_blkno && !list_empty(&bd->bd_list))
 692                                 list_del_init(&bd->bd_list);
 693                         if (list_empty(&bd->bd_list))
 694                                 kmem_cache_free(gfs2_bufdata_cachep, bd);
 695                 }
 696
 697                 bh = bh->b_this_page;
 698         } while (bh != head);
 699         gfs2_log_unlock(sdp);
 700
 701         return try_to_free_buffers(folio);
 702
 703 cannot_release:
 704         gfs2_log_unlock(sdp);
 705         return false;
 706 }
 707
 708 static const struct address_space_operations gfs2_aops = {
 709         .writepages = gfs2_writepages,
 710         .read_folio = gfs2_read_folio,
 711         .readahead = gfs2_readahead,
 712         .dirty_folio = iomap_dirty_folio,
 713         .release_folio = iomap_release_folio,
 714         .invalidate_folio = iomap_invalidate_folio,
 715         .bmap = gfs2_bmap,
 716         .migrate_folio = filemap_migrate_folio,
 717         .is_partially_uptodate = iomap_is_partially_uptodate,
 718         .error_remove_folio = generic_error_remove_folio,
 719 };
 720
 721 static const struct address_space_operations gfs2_jdata_aops = {
 722         .writepages = gfs2_jdata_writepages,
 723         .read_folio = gfs2_read_folio,
 724         .readahead = gfs2_readahead,
 725         .dirty_folio = jdata_dirty_folio,
 726         .bmap = gfs2_bmap,
 727         .migrate_folio = buffer_migrate_folio,
 728         .invalidate_folio = gfs2_invalidate_folio,
 729         .release_folio = gfs2_release_folio,
 730         .is_partially_uptodate = block_is_partially_uptodate,
 731         .error_remove_folio = generic_error_remove_folio,
 732 };
 733
 734 void gfs2_set_aops(struct inode *inode)
 735 {
 736         if (gfs2_is_jdata(GFS2_I(inode)))
 737                 inode->i_mapping->a_ops = &gfs2_jdata_aops;
 738         else
 739                 inode->i_mapping->a_ops = &gfs2_aops;
 740 }