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 /**
41 * gfs2_get_block_noalloc - Fills in a buffer head with details about a block
42 * @inode: The inode
43 * @lblock: The block number to look up
44 * @bh_result: The buffer head to return the result in
45 * @create: Non-zero if we may add block to the file
46 *
47 * Returns: errno
48 */
49
gfs2_get_block_noalloc(struct inode * inode,sector_t lblock,struct buffer_head * bh_result,int create)50 static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock,
51 struct buffer_head *bh_result, int create)
52 {
53 int error;
54
55 error = gfs2_block_map(inode, lblock, bh_result, 0);
56 if (error)
57 return error;
58 if (!buffer_mapped(bh_result))
59 return -ENODATA;
60 return 0;
61 }
62
63 /**
64 * gfs2_write_jdata_folio - gfs2 jdata-specific version of block_write_full_folio
65 * @folio: The folio to write
66 * @wbc: The writeback control
67 *
68 * This is the same as calling block_write_full_folio, but it also
69 * writes pages outside of i_size
70 */
gfs2_write_jdata_folio(struct folio * folio,struct writeback_control * wbc)71 static int gfs2_write_jdata_folio(struct folio *folio,
72 struct writeback_control *wbc)
73 {
74 struct inode * const inode = folio->mapping->host;
75 loff_t i_size = i_size_read(inode);
76
77 /*
78 * The folio straddles i_size. It must be zeroed out on each and every
79 * writepage invocation because it may be mmapped. "A file is mapped
80 * in multiples of the page size. For a file that is not a multiple of
81 * the page size, the remaining memory is zeroed when mapped, and
82 * writes to that region are not written out to the file."
83 */
84 if (folio_pos(folio) < i_size &&
85 i_size < folio_pos(folio) + folio_size(folio))
86 folio_zero_segment(folio, offset_in_folio(folio, i_size),
87 folio_size(folio));
88
89 return __block_write_full_folio(inode, folio, gfs2_get_block_noalloc,
90 wbc);
91 }
92
93 /**
94 * __gfs2_jdata_write_folio - The core of jdata writepage
95 * @folio: The folio to write
96 * @wbc: The writeback control
97 *
98 * Implements the core of write back. If a transaction is required then
99 * the checked flag will have been set and the transaction will have
100 * already been started before this is called.
101 */
__gfs2_jdata_write_folio(struct folio * folio,struct writeback_control * wbc)102 static int __gfs2_jdata_write_folio(struct folio *folio,
103 struct writeback_control *wbc)
104 {
105 struct inode *inode = folio->mapping->host;
106 struct gfs2_inode *ip = GFS2_I(inode);
107
108 if (folio_test_checked(folio)) {
109 folio_clear_checked(folio);
110 if (!folio_buffers(folio)) {
111 create_empty_buffers(folio,
112 inode->i_sb->s_blocksize,
113 BIT(BH_Dirty)|BIT(BH_Uptodate));
114 }
115 gfs2_trans_add_databufs(ip->i_gl, folio, 0, folio_size(folio));
116 }
117 return gfs2_write_jdata_folio(folio, wbc);
118 }
119
120 /**
121 * gfs2_jdata_writeback - Write jdata folios to the log
122 * @mapping: The mapping to write
123 * @wbc: The writeback control
124 *
125 * Returns: errno
126 */
gfs2_jdata_writeback(struct address_space * mapping,struct writeback_control * wbc)127 int gfs2_jdata_writeback(struct address_space *mapping, struct writeback_control *wbc)
128 {
129 struct inode *inode = mapping->host;
130 struct gfs2_inode *ip = GFS2_I(inode);
131 struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
132 struct folio *folio = NULL;
133 int error;
134
135 BUG_ON(current->journal_info);
136 if (gfs2_assert_withdraw(sdp, ip->i_gl->gl_state == LM_ST_EXCLUSIVE))
137 return 0;
138
139 while ((folio = writeback_iter(mapping, wbc, folio, &error))) {
140 if (folio_test_checked(folio)) {
141 folio_redirty_for_writepage(wbc, folio);
142 folio_unlock(folio);
143 continue;
144 }
145 error = __gfs2_jdata_write_folio(folio, wbc);
146 }
147
148 return error;
149 }
150
151 /**
152 * gfs2_writepages - Write a bunch of dirty pages back to disk
153 * @mapping: The mapping to write
154 * @wbc: Write-back control
155 *
156 * Used for both ordered and writeback modes.
157 */
gfs2_writepages(struct address_space * mapping,struct writeback_control * wbc)158 static int gfs2_writepages(struct address_space *mapping,
159 struct writeback_control *wbc)
160 {
161 struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
162 struct iomap_writepage_ctx wpc = { };
163 int ret;
164
165 /*
166 * Even if we didn't write enough pages here, we might still be holding
167 * dirty pages in the ail. We forcibly flush the ail because we don't
168 * want balance_dirty_pages() to loop indefinitely trying to write out
169 * pages held in the ail that it can't find.
170 */
171 ret = iomap_writepages(mapping, wbc, &wpc, &gfs2_writeback_ops);
172 if (ret == 0 && wbc->nr_to_write > 0)
173 set_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags);
174 return ret;
175 }
176
177 /**
178 * gfs2_write_jdata_batch - Write back a folio batch's worth of folios
179 * @mapping: The mapping
180 * @wbc: The writeback control
181 * @fbatch: The batch of folios
182 * @done_index: Page index
183 *
184 * Returns: non-zero if loop should terminate, zero otherwise
185 */
186
gfs2_write_jdata_batch(struct address_space * mapping,struct writeback_control * wbc,struct folio_batch * fbatch,pgoff_t * done_index)187 static int gfs2_write_jdata_batch(struct address_space *mapping,
188 struct writeback_control *wbc,
189 struct folio_batch *fbatch,
190 pgoff_t *done_index)
191 {
192 struct inode *inode = mapping->host;
193 struct gfs2_sbd *sdp = GFS2_SB(inode);
194 unsigned nrblocks;
195 int i;
196 int ret;
197 size_t size = 0;
198 int nr_folios = folio_batch_count(fbatch);
199
200 for (i = 0; i < nr_folios; i++)
201 size += folio_size(fbatch->folios[i]);
202 nrblocks = size >> inode->i_blkbits;
203
204 ret = gfs2_trans_begin(sdp, nrblocks, nrblocks);
205 if (ret < 0)
206 return ret;
207
208 for (i = 0; i < nr_folios; i++) {
209 struct folio *folio = fbatch->folios[i];
210
211 *done_index = folio->index;
212
213 folio_lock(folio);
214
215 if (unlikely(folio->mapping != mapping)) {
216 continue_unlock:
217 folio_unlock(folio);
218 continue;
219 }
220
221 if (!folio_test_dirty(folio)) {
222 /* someone wrote it for us */
223 goto continue_unlock;
224 }
225
226 if (folio_test_writeback(folio)) {
227 if (wbc->sync_mode != WB_SYNC_NONE)
228 folio_wait_writeback(folio);
229 else
230 goto continue_unlock;
231 }
232
233 BUG_ON(folio_test_writeback(folio));
234 if (!folio_clear_dirty_for_io(folio))
235 goto continue_unlock;
236
237 trace_wbc_writepage(wbc, inode_to_bdi(inode));
238
239 ret = __gfs2_jdata_write_folio(folio, wbc);
240 if (unlikely(ret)) {
241 if (ret == AOP_WRITEPAGE_ACTIVATE) {
242 folio_unlock(folio);
243 ret = 0;
244 } else {
245
246 /*
247 * done_index is set past this page,
248 * so media errors will not choke
249 * background writeout for the entire
250 * file. This has consequences for
251 * range_cyclic semantics (ie. it may
252 * not be suitable for data integrity
253 * writeout).
254 */
255 *done_index = folio_next_index(folio);
256 ret = 1;
257 break;
258 }
259 }
260
261 /*
262 * We stop writing back only if we are not doing
263 * integrity sync. In case of integrity sync we have to
264 * keep going until we have written all the pages
265 * we tagged for writeback prior to entering this loop.
266 */
267 if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) {
268 ret = 1;
269 break;
270 }
271
272 }
273 gfs2_trans_end(sdp);
274 return ret;
275 }
276
277 /**
278 * gfs2_write_cache_jdata - Like write_cache_pages but different
279 * @mapping: The mapping to write
280 * @wbc: The writeback control
281 *
282 * The reason that we use our own function here is that we need to
283 * start transactions before we grab page locks. This allows us
284 * to get the ordering right.
285 */
286
gfs2_write_cache_jdata(struct address_space * mapping,struct writeback_control * wbc)287 static int gfs2_write_cache_jdata(struct address_space *mapping,
288 struct writeback_control *wbc)
289 {
290 int ret = 0;
291 int done = 0;
292 struct folio_batch fbatch;
293 int nr_folios;
294 pgoff_t writeback_index;
295 pgoff_t index;
296 pgoff_t end;
297 pgoff_t done_index;
298 int cycled;
299 int range_whole = 0;
300 xa_mark_t tag;
301
302 folio_batch_init(&fbatch);
303 if (wbc->range_cyclic) {
304 writeback_index = mapping->writeback_index; /* prev offset */
305 index = writeback_index;
306 if (index == 0)
307 cycled = 1;
308 else
309 cycled = 0;
310 end = -1;
311 } else {
312 index = wbc->range_start >> PAGE_SHIFT;
313 end = wbc->range_end >> PAGE_SHIFT;
314 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
315 range_whole = 1;
316 cycled = 1; /* ignore range_cyclic tests */
317 }
318 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
319 tag = PAGECACHE_TAG_TOWRITE;
320 else
321 tag = PAGECACHE_TAG_DIRTY;
322
323 retry:
324 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
325 tag_pages_for_writeback(mapping, index, end);
326 done_index = index;
327 while (!done && (index <= end)) {
328 nr_folios = filemap_get_folios_tag(mapping, &index, end,
329 tag, &fbatch);
330 if (nr_folios == 0)
331 break;
332
333 ret = gfs2_write_jdata_batch(mapping, wbc, &fbatch,
334 &done_index);
335 if (ret)
336 done = 1;
337 if (ret > 0)
338 ret = 0;
339 folio_batch_release(&fbatch);
340 cond_resched();
341 }
342
343 if (!cycled && !done) {
344 /*
345 * range_cyclic:
346 * We hit the last page and there is more work to be done: wrap
347 * back to the start of the file
348 */
349 cycled = 1;
350 index = 0;
351 end = writeback_index - 1;
352 goto retry;
353 }
354
355 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
356 mapping->writeback_index = done_index;
357
358 return ret;
359 }
360
361
362 /**
363 * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk
364 * @mapping: The mapping to write
365 * @wbc: The writeback control
366 *
367 */
368
gfs2_jdata_writepages(struct address_space * mapping,struct writeback_control * wbc)369 static int gfs2_jdata_writepages(struct address_space *mapping,
370 struct writeback_control *wbc)
371 {
372 struct gfs2_inode *ip = GFS2_I(mapping->host);
373 struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
374 int ret;
375
376 ret = gfs2_write_cache_jdata(mapping, wbc);
377 if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) {
378 gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
379 GFS2_LFC_JDATA_WPAGES);
380 ret = gfs2_write_cache_jdata(mapping, wbc);
381 }
382 return ret;
383 }
384
385 /**
386 * stuffed_read_folio - Fill in a Linux folio with stuffed file data
387 * @ip: the inode
388 * @folio: the folio
389 *
390 * Returns: errno
391 */
stuffed_read_folio(struct gfs2_inode * ip,struct folio * folio)392 static int stuffed_read_folio(struct gfs2_inode *ip, struct folio *folio)
393 {
394 struct buffer_head *dibh = NULL;
395 size_t dsize = i_size_read(&ip->i_inode);
396 void *from = NULL;
397 int error = 0;
398
399 /*
400 * Due to the order of unstuffing files and ->fault(), we can be
401 * asked for a zero folio in the case of a stuffed file being extended,
402 * so we need to supply one here. It doesn't happen often.
403 */
404 if (unlikely(folio->index)) {
405 dsize = 0;
406 } else {
407 error = gfs2_meta_inode_buffer(ip, &dibh);
408 if (error)
409 goto out;
410 from = dibh->b_data + sizeof(struct gfs2_dinode);
411 }
412
413 folio_fill_tail(folio, 0, from, dsize);
414 brelse(dibh);
415 out:
416 folio_end_read(folio, error == 0);
417
418 return error;
419 }
420
421 /**
422 * gfs2_read_folio - read a folio from a file
423 * @file: The file to read
424 * @folio: The folio in the file
425 */
gfs2_read_folio(struct file * file,struct folio * folio)426 static int gfs2_read_folio(struct file *file, struct folio *folio)
427 {
428 struct inode *inode = folio->mapping->host;
429 struct gfs2_inode *ip = GFS2_I(inode);
430 struct gfs2_sbd *sdp = GFS2_SB(inode);
431 int error;
432
433 if (!gfs2_is_jdata(ip) ||
434 (i_blocksize(inode) == PAGE_SIZE && !folio_buffers(folio))) {
435 error = iomap_read_folio(folio, &gfs2_iomap_ops);
436 } else if (gfs2_is_stuffed(ip)) {
437 error = stuffed_read_folio(ip, folio);
438 } else {
439 error = mpage_read_folio(folio, gfs2_block_map);
440 }
441
442 if (gfs2_withdrawing_or_withdrawn(sdp))
443 return -EIO;
444
445 return error;
446 }
447
448 /**
449 * gfs2_internal_read - read an internal file
450 * @ip: The gfs2 inode
451 * @buf: The buffer to fill
452 * @pos: The file position
453 * @size: The amount to read
454 *
455 */
456
gfs2_internal_read(struct gfs2_inode * ip,char * buf,loff_t * pos,size_t size)457 ssize_t gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos,
458 size_t size)
459 {
460 struct address_space *mapping = ip->i_inode.i_mapping;
461 unsigned long index = *pos >> PAGE_SHIFT;
462 size_t copied = 0;
463
464 do {
465 size_t offset, chunk;
466 struct folio *folio;
467
468 folio = read_cache_folio(mapping, index, gfs2_read_folio, NULL);
469 if (IS_ERR(folio)) {
470 if (PTR_ERR(folio) == -EINTR)
471 continue;
472 return PTR_ERR(folio);
473 }
474 offset = *pos + copied - folio_pos(folio);
475 chunk = min(size - copied, folio_size(folio) - offset);
476 memcpy_from_folio(buf + copied, folio, offset, chunk);
477 index = folio_next_index(folio);
478 folio_put(folio);
479 copied += chunk;
480 } while(copied < size);
481 (*pos) += size;
482 return size;
483 }
484
485 /**
486 * gfs2_readahead - Read a bunch of pages at once
487 * @rac: Read-ahead control structure
488 *
489 * Some notes:
490 * 1. This is only for readahead, so we can simply ignore any things
491 * which are slightly inconvenient (such as locking conflicts between
492 * the page lock and the glock) and return having done no I/O. Its
493 * obviously not something we'd want to do on too regular a basis.
494 * Any I/O we ignore at this time will be done via readpage later.
495 * 2. We don't handle stuffed files here we let readpage do the honours.
496 * 3. mpage_readahead() does most of the heavy lifting in the common case.
497 * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places.
498 */
499
gfs2_readahead(struct readahead_control * rac)500 static void gfs2_readahead(struct readahead_control *rac)
501 {
502 struct inode *inode = rac->mapping->host;
503 struct gfs2_inode *ip = GFS2_I(inode);
504
505 if (gfs2_is_stuffed(ip))
506 ;
507 else if (gfs2_is_jdata(ip))
508 mpage_readahead(rac, gfs2_block_map);
509 else
510 iomap_readahead(rac, &gfs2_iomap_ops);
511 }
512
513 /**
514 * adjust_fs_space - Adjusts the free space available due to gfs2_grow
515 * @inode: the rindex inode
516 */
adjust_fs_space(struct inode * inode)517 void adjust_fs_space(struct inode *inode)
518 {
519 struct gfs2_sbd *sdp = GFS2_SB(inode);
520 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
521 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
522 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
523 struct buffer_head *m_bh;
524 u64 fs_total, new_free;
525
526 if (gfs2_trans_begin(sdp, 2 * RES_STATFS, 0) != 0)
527 return;
528
529 /* Total up the file system space, according to the latest rindex. */
530 fs_total = gfs2_ri_total(sdp);
531 if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0)
532 goto out;
533
534 spin_lock(&sdp->sd_statfs_spin);
535 gfs2_statfs_change_in(m_sc, m_bh->b_data +
536 sizeof(struct gfs2_dinode));
537 if (fs_total > (m_sc->sc_total + l_sc->sc_total))
538 new_free = fs_total - (m_sc->sc_total + l_sc->sc_total);
539 else
540 new_free = 0;
541 spin_unlock(&sdp->sd_statfs_spin);
542 fs_warn(sdp, "File system extended by %llu blocks.\n",
543 (unsigned long long)new_free);
544 gfs2_statfs_change(sdp, new_free, new_free, 0);
545
546 update_statfs(sdp, m_bh);
547 brelse(m_bh);
548 out:
549 sdp->sd_rindex_uptodate = 0;
550 gfs2_trans_end(sdp);
551 }
552
jdata_dirty_folio(struct address_space * mapping,struct folio * folio)553 static bool jdata_dirty_folio(struct address_space *mapping,
554 struct folio *folio)
555 {
556 if (current->journal_info)
557 folio_set_checked(folio);
558 return block_dirty_folio(mapping, folio);
559 }
560
561 /**
562 * gfs2_bmap - Block map function
563 * @mapping: Address space info
564 * @lblock: The block to map
565 *
566 * Returns: The disk address for the block or 0 on hole or error
567 */
568
gfs2_bmap(struct address_space * mapping,sector_t lblock)569 static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
570 {
571 struct gfs2_inode *ip = GFS2_I(mapping->host);
572 struct gfs2_holder i_gh;
573 sector_t dblock = 0;
574 int error;
575
576 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
577 if (error)
578 return 0;
579
580 if (!gfs2_is_stuffed(ip))
581 dblock = iomap_bmap(mapping, lblock, &gfs2_iomap_ops);
582
583 gfs2_glock_dq_uninit(&i_gh);
584
585 return dblock;
586 }
587
gfs2_discard(struct gfs2_sbd * sdp,struct buffer_head * bh)588 static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh)
589 {
590 struct gfs2_bufdata *bd;
591
592 lock_buffer(bh);
593 gfs2_log_lock(sdp);
594 clear_buffer_dirty(bh);
595 bd = bh->b_private;
596 if (bd) {
597 if (!list_empty(&bd->bd_list) && !buffer_pinned(bh))
598 list_del_init(&bd->bd_list);
599 else {
600 spin_lock(&sdp->sd_ail_lock);
601 gfs2_remove_from_journal(bh, REMOVE_JDATA);
602 spin_unlock(&sdp->sd_ail_lock);
603 }
604 }
605 bh->b_bdev = NULL;
606 clear_buffer_mapped(bh);
607 clear_buffer_req(bh);
608 clear_buffer_new(bh);
609 gfs2_log_unlock(sdp);
610 unlock_buffer(bh);
611 }
612
gfs2_invalidate_folio(struct folio * folio,size_t offset,size_t length)613 static void gfs2_invalidate_folio(struct folio *folio, size_t offset,
614 size_t length)
615 {
616 struct gfs2_sbd *sdp = GFS2_SB(folio->mapping->host);
617 size_t stop = offset + length;
618 int partial_page = (offset || length < folio_size(folio));
619 struct buffer_head *bh, *head;
620 unsigned long pos = 0;
621
622 BUG_ON(!folio_test_locked(folio));
623 if (!partial_page)
624 folio_clear_checked(folio);
625 head = folio_buffers(folio);
626 if (!head)
627 goto out;
628
629 bh = head;
630 do {
631 if (pos + bh->b_size > stop)
632 return;
633
634 if (offset <= pos)
635 gfs2_discard(sdp, bh);
636 pos += bh->b_size;
637 bh = bh->b_this_page;
638 } while (bh != head);
639 out:
640 if (!partial_page)
641 filemap_release_folio(folio, 0);
642 }
643
644 /**
645 * gfs2_release_folio - free the metadata associated with a folio
646 * @folio: the folio that's being released
647 * @gfp_mask: passed from Linux VFS, ignored by us
648 *
649 * Calls try_to_free_buffers() to free the buffers and put the folio if the
650 * buffers can be released.
651 *
652 * Returns: true if the folio was put or else false
653 */
654
gfs2_release_folio(struct folio * folio,gfp_t gfp_mask)655 bool gfs2_release_folio(struct folio *folio, gfp_t gfp_mask)
656 {
657 struct address_space *mapping = folio->mapping;
658 struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
659 struct buffer_head *bh, *head;
660 struct gfs2_bufdata *bd;
661
662 head = folio_buffers(folio);
663 if (!head)
664 return false;
665
666 /*
667 * mm accommodates an old ext3 case where clean folios might
668 * not have had the dirty bit cleared. Thus, it can send actual
669 * dirty folios to ->release_folio() via shrink_active_list().
670 *
671 * As a workaround, we skip folios that contain dirty buffers
672 * below. Once ->release_folio isn't called on dirty folios
673 * anymore, we can warn on dirty buffers like we used to here
674 * again.
675 */
676
677 gfs2_log_lock(sdp);
678 bh = head;
679 do {
680 if (atomic_read(&bh->b_count))
681 goto cannot_release;
682 bd = bh->b_private;
683 if (bd && bd->bd_tr)
684 goto cannot_release;
685 if (buffer_dirty(bh) || WARN_ON(buffer_pinned(bh)))
686 goto cannot_release;
687 bh = bh->b_this_page;
688 } while (bh != head);
689
690 bh = head;
691 do {
692 bd = bh->b_private;
693 if (bd) {
694 gfs2_assert_warn(sdp, bd->bd_bh == bh);
695 bd->bd_bh = NULL;
696 bh->b_private = NULL;
697 /*
698 * The bd may still be queued as a revoke, in which
699 * case we must not dequeue nor free it.
700 */
701 if (!bd->bd_blkno && !list_empty(&bd->bd_list))
702 list_del_init(&bd->bd_list);
703 if (list_empty(&bd->bd_list))
704 kmem_cache_free(gfs2_bufdata_cachep, bd);
705 }
706
707 bh = bh->b_this_page;
708 } while (bh != head);
709 gfs2_log_unlock(sdp);
710
711 return try_to_free_buffers(folio);
712
713 cannot_release:
714 gfs2_log_unlock(sdp);
715 return false;
716 }
717
718 static const struct address_space_operations gfs2_aops = {
719 .writepages = gfs2_writepages,
720 .read_folio = gfs2_read_folio,
721 .readahead = gfs2_readahead,
722 .dirty_folio = iomap_dirty_folio,
723 .release_folio = iomap_release_folio,
724 .invalidate_folio = iomap_invalidate_folio,
725 .bmap = gfs2_bmap,
726 .migrate_folio = filemap_migrate_folio,
727 .is_partially_uptodate = iomap_is_partially_uptodate,
728 .error_remove_folio = generic_error_remove_folio,
729 };
730
731 static const struct address_space_operations gfs2_jdata_aops = {
732 .writepages = gfs2_jdata_writepages,
733 .read_folio = gfs2_read_folio,
734 .readahead = gfs2_readahead,
735 .dirty_folio = jdata_dirty_folio,
736 .bmap = gfs2_bmap,
737 .migrate_folio = buffer_migrate_folio,
738 .invalidate_folio = gfs2_invalidate_folio,
739 .release_folio = gfs2_release_folio,
740 .is_partially_uptodate = block_is_partially_uptodate,
741 .error_remove_folio = generic_error_remove_folio,
742 };
743
gfs2_set_aops(struct inode * inode)744 void gfs2_set_aops(struct inode *inode)
745 {
746 if (gfs2_is_jdata(GFS2_I(inode)))
747 inode->i_mapping->a_ops = &gfs2_jdata_aops;
748 else
749 inode->i_mapping->a_ops = &gfs2_aops;
750 }
751