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_jdata_writepage - Write complete page
 143  * @page: Page to write
 144  * @wbc: The writeback control
 145  *
 146  * Returns: errno
 147  *
 148  */
 149
 150 static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
 151 {
 152         struct folio *folio = page_folio(page);
 153         struct inode *inode = page->mapping->host;
 154         struct gfs2_inode *ip = GFS2_I(inode);
 155         struct gfs2_sbd *sdp = GFS2_SB(inode);
 156
 157         if (gfs2_assert_withdraw(sdp, ip->i_gl->gl_state == LM_ST_EXCLUSIVE))
 158                 goto out;
 159         if (folio_test_checked(folio) || current->journal_info)
 160                 goto out_ignore;
 161         return __gfs2_jdata_write_folio(folio, wbc);
 162
 163 out_ignore:
 164         folio_redirty_for_writepage(wbc, folio);
 165 out:
 166         folio_unlock(folio);
 167         return 0;
 168 }
 169
 170 /**
 171  * gfs2_writepages - Write a bunch of dirty pages back to disk
 172  * @mapping: The mapping to write
 173  * @wbc: Write-back control
 174  *
 175  * Used for both ordered and writeback modes.
 176  */
 177 static int gfs2_writepages(struct address_space *mapping,
 178                            struct writeback_control *wbc)
 179 {
 180         struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
 181         struct iomap_writepage_ctx wpc = { };
 182         int ret;
 183
 184         /*
 185          * Even if we didn't write enough pages here, we might still be holding
 186          * dirty pages in the ail. We forcibly flush the ail because we don't
 187          * want balance_dirty_pages() to loop indefinitely trying to write out
 188          * pages held in the ail that it can't find.
 189          */
 190         ret = iomap_writepages(mapping, wbc, &wpc, &gfs2_writeback_ops);
 191         if (ret == 0 && wbc->nr_to_write > 0)
 192                 set_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags);
 193         return ret;
 194 }
 195
 196 /**
 197  * gfs2_write_jdata_batch - Write back a folio batch's worth of folios
 198  * @mapping: The mapping
 199  * @wbc: The writeback control
 200  * @fbatch: The batch of folios
 201  * @done_index: Page index
 202  *
 203  * Returns: non-zero if loop should terminate, zero otherwise
 204  */
 205
 206 static int gfs2_write_jdata_batch(struct address_space *mapping,
 207                                     struct writeback_control *wbc,
 208                                     struct folio_batch *fbatch,
 209                                     pgoff_t *done_index)
 210 {
 211         struct inode *inode = mapping->host;
 212         struct gfs2_sbd *sdp = GFS2_SB(inode);
 213         unsigned nrblocks;
 214         int i;
 215         int ret;
 216         size_t size = 0;
 217         int nr_folios = folio_batch_count(fbatch);
 218
 219         for (i = 0; i < nr_folios; i++)
 220                 size += folio_size(fbatch->folios[i]);
 221         nrblocks = size >> inode->i_blkbits;
 222
 223         ret = gfs2_trans_begin(sdp, nrblocks, nrblocks);
 224         if (ret < 0)
 225                 return ret;
 226
 227         for (i = 0; i < nr_folios; i++) {
 228                 struct folio *folio = fbatch->folios[i];
 229
 230                 *done_index = folio->index;
 231
 232                 folio_lock(folio);
 233
 234                 if (unlikely(folio->mapping != mapping)) {
 235 continue_unlock:
 236                         folio_unlock(folio);
 237                         continue;
 238                 }
 239
 240                 if (!folio_test_dirty(folio)) {
 241                         /* someone wrote it for us */
 242                         goto continue_unlock;
 243                 }
 244
 245                 if (folio_test_writeback(folio)) {
 246                         if (wbc->sync_mode != WB_SYNC_NONE)
 247                                 folio_wait_writeback(folio);
 248                         else
 249                                 goto continue_unlock;
 250                 }
 251
 252                 BUG_ON(folio_test_writeback(folio));
 253                 if (!folio_clear_dirty_for_io(folio))
 254                         goto continue_unlock;
 255
 256                 trace_wbc_writepage(wbc, inode_to_bdi(inode));
 257
 258                 ret = __gfs2_jdata_write_folio(folio, wbc);
 259                 if (unlikely(ret)) {
 260                         if (ret == AOP_WRITEPAGE_ACTIVATE) {
 261                                 folio_unlock(folio);
 262                                 ret = 0;
 263                         } else {
 264
 265                                 /*
 266                                  * done_index is set past this page,
 267                                  * so media errors will not choke
 268                                  * background writeout for the entire
 269                                  * file. This has consequences for
 270                                  * range_cyclic semantics (ie. it may
 271                                  * not be suitable for data integrity
 272                                  * writeout).
 273                                  */
 274                                 *done_index = folio_next_index(folio);
 275                                 ret = 1;
 276                                 break;
 277                         }
 278                 }
 279
 280                 /*
 281                  * We stop writing back only if we are not doing
 282                  * integrity sync. In case of integrity sync we have to
 283                  * keep going until we have written all the pages
 284                  * we tagged for writeback prior to entering this loop.
 285                  */
 286                 if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) {
 287                         ret = 1;
 288                         break;
 289                 }
 290
 291         }
 292         gfs2_trans_end(sdp);
 293         return ret;
 294 }
 295
 296 /**
 297  * gfs2_write_cache_jdata - Like write_cache_pages but different
 298  * @mapping: The mapping to write
 299  * @wbc: The writeback control
 300  *
 301  * The reason that we use our own function here is that we need to
 302  * start transactions before we grab page locks. This allows us
 303  * to get the ordering right.
 304  */
 305
 306 static int gfs2_write_cache_jdata(struct address_space *mapping,
 307                                   struct writeback_control *wbc)
 308 {
 309         int ret = 0;
 310         int done = 0;
 311         struct folio_batch fbatch;
 312         int nr_folios;
 313         pgoff_t writeback_index;
 314         pgoff_t index;
 315         pgoff_t end;
 316         pgoff_t done_index;
 317         int cycled;
 318         int range_whole = 0;
 319         xa_mark_t tag;
 320
 321         folio_batch_init(&fbatch);
 322         if (wbc->range_cyclic) {
 323                 writeback_index = mapping->writeback_index; /* prev offset */
 324                 index = writeback_index;
 325                 if (index == 0)
 326                         cycled = 1;
 327                 else
 328                         cycled = 0;
 329                 end = -1;
 330         } else {
 331                 index = wbc->range_start >> PAGE_SHIFT;
 332                 end = wbc->range_end >> PAGE_SHIFT;
 333                 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
 334                         range_whole = 1;
 335                 cycled = 1; /* ignore range_cyclic tests */
 336         }
 337         if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
 338                 tag = PAGECACHE_TAG_TOWRITE;
 339         else
 340                 tag = PAGECACHE_TAG_DIRTY;
 341
 342 retry:
 343         if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
 344                 tag_pages_for_writeback(mapping, index, end);
 345         done_index = index;
 346         while (!done && (index <= end)) {
 347                 nr_folios = filemap_get_folios_tag(mapping, &index, end,
 348                                 tag, &fbatch);
 349                 if (nr_folios == 0)
 350                         break;
 351
 352                 ret = gfs2_write_jdata_batch(mapping, wbc, &fbatch,
 353                                 &done_index);
 354                 if (ret)
 355                         done = 1;
 356                 if (ret > 0)
 357                         ret = 0;
 358                 folio_batch_release(&fbatch);
 359                 cond_resched();
 360         }
 361
 362         if (!cycled && !done) {
 363                 /*
 364                  * range_cyclic:
 365                  * We hit the last page and there is more work to be done: wrap
 366                  * back to the start of the file
 367                  */
 368                 cycled = 1;
 369                 index = 0;
 370                 end = writeback_index - 1;
 371                 goto retry;
 372         }
 373
 374         if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
 375                 mapping->writeback_index = done_index;
 376
 377         return ret;
 378 }
 379
 380
 381 /**
 382  * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk
 383  * @mapping: The mapping to write
 384  * @wbc: The writeback control
 385  *
 386  */
 387
 388 static int gfs2_jdata_writepages(struct address_space *mapping,
 389                                  struct writeback_control *wbc)
 390 {
 391         struct gfs2_inode *ip = GFS2_I(mapping->host);
 392         struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
 393         int ret;
 394
 395         ret = gfs2_write_cache_jdata(mapping, wbc);
 396         if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) {
 397                 gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
 398                                GFS2_LFC_JDATA_WPAGES);
 399                 ret = gfs2_write_cache_jdata(mapping, wbc);
 400         }
 401         return ret;
 402 }
 403
 404 /**
 405  * stuffed_read_folio - Fill in a Linux folio with stuffed file data
 406  * @ip: the inode
 407  * @folio: the folio
 408  *
 409  * Returns: errno
 410  */
 411 static int stuffed_read_folio(struct gfs2_inode *ip, struct folio *folio)
 412 {
 413         struct buffer_head *dibh = NULL;
 414         size_t dsize = i_size_read(&ip->i_inode);
 415         void *from = NULL;
 416         int error = 0;
 417
 418         /*
 419          * Due to the order of unstuffing files and ->fault(), we can be
 420          * asked for a zero folio in the case of a stuffed file being extended,
 421          * so we need to supply one here. It doesn't happen often.
 422          */
 423         if (unlikely(folio->index)) {
 424                 dsize = 0;
 425         } else {
 426                 error = gfs2_meta_inode_buffer(ip, &dibh);
 427                 if (error)
 428                         goto out;
 429                 from = dibh->b_data + sizeof(struct gfs2_dinode);
 430         }
 431
 432         folio_fill_tail(folio, 0, from, dsize);
 433         brelse(dibh);
 434 out:
 435         folio_end_read(folio, error == 0);
 436
 437         return error;
 438 }
 439
 440 /**
 441  * gfs2_read_folio - read a folio from a file
 442  * @file: The file to read
 443  * @folio: The folio in the file
 444  */
 445 static int gfs2_read_folio(struct file *file, struct folio *folio)
 446 {
 447         struct inode *inode = folio->mapping->host;
 448         struct gfs2_inode *ip = GFS2_I(inode);
 449         struct gfs2_sbd *sdp = GFS2_SB(inode);
 450         int error;
 451
 452         if (!gfs2_is_jdata(ip) ||
 453             (i_blocksize(inode) == PAGE_SIZE && !folio_buffers(folio))) {
 454                 error = iomap_read_folio(folio, &gfs2_iomap_ops);
 455         } else if (gfs2_is_stuffed(ip)) {
 456                 error = stuffed_read_folio(ip, folio);
 457         } else {
 458                 error = mpage_read_folio(folio, gfs2_block_map);
 459         }
 460
 461         if (gfs2_withdrawing_or_withdrawn(sdp))
 462                 return -EIO;
 463
 464         return error;
 465 }
 466
 467 /**
 468  * gfs2_internal_read - read an internal file
 469  * @ip: The gfs2 inode
 470  * @buf: The buffer to fill
 471  * @pos: The file position
 472  * @size: The amount to read
 473  *
 474  */
 475
 476 ssize_t gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos,
 477                            size_t size)
 478 {
 479         struct address_space *mapping = ip->i_inode.i_mapping;
 480         unsigned long index = *pos >> PAGE_SHIFT;
 481         size_t copied = 0;
 482
 483         do {
 484                 size_t offset, chunk;
 485                 struct folio *folio;
 486
 487                 folio = read_cache_folio(mapping, index, gfs2_read_folio, NULL);
 488                 if (IS_ERR(folio)) {
 489                         if (PTR_ERR(folio) == -EINTR)
 490                                 continue;
 491                         return PTR_ERR(folio);
 492                 }
 493                 offset = *pos + copied - folio_pos(folio);
 494                 chunk = min(size - copied, folio_size(folio) - offset);
 495                 memcpy_from_folio(buf + copied, folio, offset, chunk);
 496                 index = folio_next_index(folio);
 497                 folio_put(folio);
 498                 copied += chunk;
 499         } while(copied < size);
 500         (*pos) += size;
 501         return size;
 502 }
 503
 504 /**
 505  * gfs2_readahead - Read a bunch of pages at once
 506  * @rac: Read-ahead control structure
 507  *
 508  * Some notes:
 509  * 1. This is only for readahead, so we can simply ignore any things
 510  *    which are slightly inconvenient (such as locking conflicts between
 511  *    the page lock and the glock) and return having done no I/O. Its
 512  *    obviously not something we'd want to do on too regular a basis.
 513  *    Any I/O we ignore at this time will be done via readpage later.
 514  * 2. We don't handle stuffed files here we let readpage do the honours.
 515  * 3. mpage_readahead() does most of the heavy lifting in the common case.
 516  * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places.
 517  */
 518
 519 static void gfs2_readahead(struct readahead_control *rac)
 520 {
 521         struct inode *inode = rac->mapping->host;
 522         struct gfs2_inode *ip = GFS2_I(inode);
 523
 524         if (gfs2_is_stuffed(ip))
 525                 ;
 526         else if (gfs2_is_jdata(ip))
 527                 mpage_readahead(rac, gfs2_block_map);
 528         else
 529                 iomap_readahead(rac, &gfs2_iomap_ops);
 530 }
 531
 532 /**
 533  * adjust_fs_space - Adjusts the free space available due to gfs2_grow
 534  * @inode: the rindex inode
 535  */
 536 void adjust_fs_space(struct inode *inode)
 537 {
 538         struct gfs2_sbd *sdp = GFS2_SB(inode);
 539         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 540         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 541         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 542         struct buffer_head *m_bh;
 543         u64 fs_total, new_free;
 544
 545         if (gfs2_trans_begin(sdp, 2 * RES_STATFS, 0) != 0)
 546                 return;
 547
 548         /* Total up the file system space, according to the latest rindex. */
 549         fs_total = gfs2_ri_total(sdp);
 550         if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0)
 551                 goto out;
 552
 553         spin_lock(&sdp->sd_statfs_spin);
 554         gfs2_statfs_change_in(m_sc, m_bh->b_data +
 555                               sizeof(struct gfs2_dinode));
 556         if (fs_total > (m_sc->sc_total + l_sc->sc_total))
 557                 new_free = fs_total - (m_sc->sc_total + l_sc->sc_total);
 558         else
 559                 new_free = 0;
 560         spin_unlock(&sdp->sd_statfs_spin);
 561         fs_warn(sdp, "File system extended by %llu blocks.\n",
 562                 (unsigned long long)new_free);
 563         gfs2_statfs_change(sdp, new_free, new_free, 0);
 564
 565         update_statfs(sdp, m_bh);
 566         brelse(m_bh);
 567 out:
 568         sdp->sd_rindex_uptodate = 0;
 569         gfs2_trans_end(sdp);
 570 }
 571
 572 static bool jdata_dirty_folio(struct address_space *mapping,
 573                 struct folio *folio)
 574 {
 575         if (current->journal_info)
 576                 folio_set_checked(folio);
 577         return block_dirty_folio(mapping, folio);
 578 }
 579
 580 /**
 581  * gfs2_bmap - Block map function
 582  * @mapping: Address space info
 583  * @lblock: The block to map
 584  *
 585  * Returns: The disk address for the block or 0 on hole or error
 586  */
 587
 588 static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
 589 {
 590         struct gfs2_inode *ip = GFS2_I(mapping->host);
 591         struct gfs2_holder i_gh;
 592         sector_t dblock = 0;
 593         int error;
 594
 595         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 596         if (error)
 597                 return 0;
 598
 599         if (!gfs2_is_stuffed(ip))
 600                 dblock = iomap_bmap(mapping, lblock, &gfs2_iomap_ops);
 601
 602         gfs2_glock_dq_uninit(&i_gh);
 603
 604         return dblock;
 605 }
 606
 607 static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh)
 608 {
 609         struct gfs2_bufdata *bd;
 610
 611         lock_buffer(bh);
 612         gfs2_log_lock(sdp);
 613         clear_buffer_dirty(bh);
 614         bd = bh->b_private;
 615         if (bd) {
 616                 if (!list_empty(&bd->bd_list) && !buffer_pinned(bh))
 617                         list_del_init(&bd->bd_list);
 618                 else {
 619                         spin_lock(&sdp->sd_ail_lock);
 620                         gfs2_remove_from_journal(bh, REMOVE_JDATA);
 621                         spin_unlock(&sdp->sd_ail_lock);
 622                 }
 623         }
 624         bh->b_bdev = NULL;
 625         clear_buffer_mapped(bh);
 626         clear_buffer_req(bh);
 627         clear_buffer_new(bh);
 628         gfs2_log_unlock(sdp);
 629         unlock_buffer(bh);
 630 }
 631
 632 static void gfs2_invalidate_folio(struct folio *folio, size_t offset,
 633                                 size_t length)
 634 {
 635         struct gfs2_sbd *sdp = GFS2_SB(folio->mapping->host);
 636         size_t stop = offset + length;
 637         int partial_page = (offset || length < folio_size(folio));
 638         struct buffer_head *bh, *head;
 639         unsigned long pos = 0;
 640
 641         BUG_ON(!folio_test_locked(folio));
 642         if (!partial_page)
 643                 folio_clear_checked(folio);
 644         head = folio_buffers(folio);
 645         if (!head)
 646                 goto out;
 647
 648         bh = head;
 649         do {
 650                 if (pos + bh->b_size > stop)
 651                         return;
 652
 653                 if (offset <= pos)
 654                         gfs2_discard(sdp, bh);
 655                 pos += bh->b_size;
 656                 bh = bh->b_this_page;
 657         } while (bh != head);
 658 out:
 659         if (!partial_page)
 660                 filemap_release_folio(folio, 0);
 661 }
 662
 663 /**
 664  * gfs2_release_folio - free the metadata associated with a folio
 665  * @folio: the folio that's being released
 666  * @gfp_mask: passed from Linux VFS, ignored by us
 667  *
 668  * Calls try_to_free_buffers() to free the buffers and put the folio if the
 669  * buffers can be released.
 670  *
 671  * Returns: true if the folio was put or else false
 672  */
 673
 674 bool gfs2_release_folio(struct folio *folio, gfp_t gfp_mask)
 675 {
 676         struct address_space *mapping = folio->mapping;
 677         struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
 678         struct buffer_head *bh, *head;
 679         struct gfs2_bufdata *bd;
 680
 681         head = folio_buffers(folio);
 682         if (!head)
 683                 return false;
 684
 685         /*
 686          * mm accommodates an old ext3 case where clean folios might
 687          * not have had the dirty bit cleared.  Thus, it can send actual
 688          * dirty folios to ->release_folio() via shrink_active_list().
 689          *
 690          * As a workaround, we skip folios that contain dirty buffers
 691          * below.  Once ->release_folio isn't called on dirty folios
 692          * anymore, we can warn on dirty buffers like we used to here
 693          * again.
 694          */
 695
 696         gfs2_log_lock(sdp);
 697         bh = head;
 698         do {
 699                 if (atomic_read(&bh->b_count))
 700                         goto cannot_release;
 701                 bd = bh->b_private;
 702                 if (bd && bd->bd_tr)
 703                         goto cannot_release;
 704                 if (buffer_dirty(bh) || WARN_ON(buffer_pinned(bh)))
 705                         goto cannot_release;
 706                 bh = bh->b_this_page;
 707         } while (bh != head);
 708
 709         bh = head;
 710         do {
 711                 bd = bh->b_private;
 712                 if (bd) {
 713                         gfs2_assert_warn(sdp, bd->bd_bh == bh);
 714                         bd->bd_bh = NULL;
 715                         bh->b_private = NULL;
 716                         /*
 717                          * The bd may still be queued as a revoke, in which
 718                          * case we must not dequeue nor free it.
 719                          */
 720                         if (!bd->bd_blkno && !list_empty(&bd->bd_list))
 721                                 list_del_init(&bd->bd_list);
 722                         if (list_empty(&bd->bd_list))
 723                                 kmem_cache_free(gfs2_bufdata_cachep, bd);
 724                 }
 725
 726                 bh = bh->b_this_page;
 727         } while (bh != head);
 728         gfs2_log_unlock(sdp);
 729
 730         return try_to_free_buffers(folio);
 731
 732 cannot_release:
 733         gfs2_log_unlock(sdp);
 734         return false;
 735 }
 736
 737 static const struct address_space_operations gfs2_aops = {
 738         .writepages = gfs2_writepages,
 739         .read_folio = gfs2_read_folio,
 740         .readahead = gfs2_readahead,
 741         .dirty_folio = iomap_dirty_folio,
 742         .release_folio = iomap_release_folio,
 743         .invalidate_folio = iomap_invalidate_folio,
 744         .bmap = gfs2_bmap,
 745         .migrate_folio = filemap_migrate_folio,
 746         .is_partially_uptodate = iomap_is_partially_uptodate,
 747         .error_remove_folio = generic_error_remove_folio,
 748 };
 749
 750 static const struct address_space_operations gfs2_jdata_aops = {
 751         .writepage = gfs2_jdata_writepage,
 752         .writepages = gfs2_jdata_writepages,
 753         .read_folio = gfs2_read_folio,
 754         .readahead = gfs2_readahead,
 755         .dirty_folio = jdata_dirty_folio,
 756         .bmap = gfs2_bmap,
 757         .migrate_folio = buffer_migrate_folio,
 758         .invalidate_folio = gfs2_invalidate_folio,
 759         .release_folio = gfs2_release_folio,
 760         .is_partially_uptodate = block_is_partially_uptodate,
 761         .error_remove_folio = generic_error_remove_folio,
 762 };
 763
 764 void gfs2_set_aops(struct inode *inode)
 765 {
 766         if (gfs2_is_jdata(GFS2_I(inode)))
 767                 inode->i_mapping->a_ops = &gfs2_jdata_aops;
 768         else
 769                 inode->i_mapping->a_ops = &gfs2_aops;
 770 }