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/folio_batch.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 && i_size < folio_next_pos(folio))
85 folio_zero_segment(folio, offset_in_folio(folio, i_size),
86 folio_size(folio));
87
88 return __block_write_full_folio(inode, folio, gfs2_get_block_noalloc,
89 wbc);
90 }
91
92 /**
93 * __gfs2_jdata_write_folio - The core of jdata writepage
94 * @folio: The folio to write
95 * @wbc: The writeback control
96 *
97 * Implements the core of write back. If a transaction is required then
98 * the checked flag will have been set and the transaction will have
99 * already been started before this is called.
100 */
__gfs2_jdata_write_folio(struct folio * folio,struct writeback_control * wbc)101 static int __gfs2_jdata_write_folio(struct folio *folio,
102 struct writeback_control *wbc)
103 {
104 struct inode *inode = folio->mapping->host;
105 struct gfs2_inode *ip = GFS2_I(inode);
106
107 if (folio_test_checked(folio)) {
108 folio_clear_checked(folio);
109 if (!folio_buffers(folio)) {
110 create_empty_buffers(folio,
111 inode->i_sb->s_blocksize,
112 BIT(BH_Dirty)|BIT(BH_Uptodate));
113 }
114 gfs2_trans_add_databufs(ip->i_gl, folio, 0, folio_size(folio));
115 }
116 return gfs2_write_jdata_folio(folio, wbc);
117 }
118
119 /**
120 * gfs2_jdata_writeback - Write jdata folios to the log
121 * @mapping: The mapping to write
122 * @wbc: The writeback control
123 *
124 * Returns: errno
125 */
gfs2_jdata_writeback(struct address_space * mapping,struct writeback_control * wbc)126 int gfs2_jdata_writeback(struct address_space *mapping, struct writeback_control *wbc)
127 {
128 struct inode *inode = mapping->host;
129 struct gfs2_inode *ip = GFS2_I(inode);
130 struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
131 struct folio *folio = NULL;
132 int error;
133
134 BUG_ON(current->journal_info);
135 if (gfs2_assert_withdraw(sdp, ip->i_gl->gl_state == LM_ST_EXCLUSIVE))
136 return 0;
137
138 while ((folio = writeback_iter(mapping, wbc, folio, &error))) {
139 if (folio_test_checked(folio)) {
140 folio_redirty_for_writepage(wbc, folio);
141 folio_unlock(folio);
142 continue;
143 }
144 error = __gfs2_jdata_write_folio(folio, wbc);
145 }
146
147 return error;
148 }
149
150 /**
151 * gfs2_writepages - Write a bunch of dirty pages back to disk
152 * @mapping: The mapping to write
153 * @wbc: Write-back control
154 *
155 * Used for both ordered and writeback modes.
156 */
gfs2_writepages(struct address_space * mapping,struct writeback_control * wbc)157 static int gfs2_writepages(struct address_space *mapping,
158 struct writeback_control *wbc)
159 {
160 struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
161 long initial_nr_to_write = wbc->nr_to_write;
162 struct iomap_writepage_ctx wpc = {
163 .inode = mapping->host,
164 .wbc = wbc,
165 .ops = &gfs2_writeback_ops,
166 };
167 int ret;
168
169 /*
170 * Even if we didn't write any pages here, we might still be holding
171 * dirty pages in the ail. We forcibly flush the ail because we don't
172 * want balance_dirty_pages() to loop indefinitely trying to write out
173 * pages held in the ail that it can't find.
174 */
175 ret = iomap_writepages(&wpc);
176 if (ret == 0 && wbc->nr_to_write == initial_nr_to_write)
177 set_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags);
178 return ret;
179 }
180
181 /**
182 * gfs2_write_jdata_batch - Write back a folio batch's worth of folios
183 * @mapping: The mapping
184 * @wbc: The writeback control
185 * @fbatch: The batch of folios
186 * @done_index: Page index
187 *
188 * Returns: non-zero if loop should terminate, zero otherwise
189 */
190
gfs2_write_jdata_batch(struct address_space * mapping,struct writeback_control * wbc,struct folio_batch * fbatch,pgoff_t * done_index)191 static int gfs2_write_jdata_batch(struct address_space *mapping,
192 struct writeback_control *wbc,
193 struct folio_batch *fbatch,
194 pgoff_t *done_index)
195 {
196 struct inode *inode = mapping->host;
197 struct gfs2_sbd *sdp = GFS2_SB(inode);
198 unsigned nrblocks;
199 int i;
200 int ret;
201 size_t size = 0;
202 int nr_folios = folio_batch_count(fbatch);
203
204 for (i = 0; i < nr_folios; i++)
205 size += folio_size(fbatch->folios[i]);
206 nrblocks = size >> inode->i_blkbits;
207
208 ret = gfs2_trans_begin(sdp, nrblocks, nrblocks);
209 if (ret < 0)
210 return ret;
211
212 for (i = 0; i < nr_folios; i++) {
213 struct folio *folio = fbatch->folios[i];
214
215 *done_index = folio->index;
216
217 folio_lock(folio);
218
219 if (unlikely(folio->mapping != mapping)) {
220 continue_unlock:
221 folio_unlock(folio);
222 continue;
223 }
224
225 if (!folio_test_dirty(folio)) {
226 /* someone wrote it for us */
227 goto continue_unlock;
228 }
229
230 if (folio_test_writeback(folio)) {
231 if (wbc->sync_mode != WB_SYNC_NONE)
232 folio_wait_writeback(folio);
233 else
234 goto continue_unlock;
235 }
236
237 BUG_ON(folio_test_writeback(folio));
238 if (!folio_clear_dirty_for_io(folio))
239 goto continue_unlock;
240
241 trace_wbc_writepage(wbc, inode_to_bdi(inode));
242
243 ret = __gfs2_jdata_write_folio(folio, wbc);
244 if (unlikely(ret)) {
245 /*
246 * done_index is set past this page, so media errors
247 * will not choke background writeout for the entire
248 * file. This has consequences for range_cyclic
249 * semantics (ie. it may not be suitable for data
250 * integrity writeout).
251 */
252 *done_index = folio_next_index(folio);
253 ret = 1;
254 break;
255 }
256
257 /*
258 * We stop writing back only if we are not doing
259 * integrity sync. In case of integrity sync we have to
260 * keep going until we have written all the pages
261 * we tagged for writeback prior to entering this loop.
262 */
263 if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) {
264 ret = 1;
265 break;
266 }
267
268 }
269 gfs2_trans_end(sdp);
270 return ret;
271 }
272
273 /**
274 * gfs2_write_cache_jdata - Like write_cache_pages but different
275 * @mapping: The mapping to write
276 * @wbc: The writeback control
277 *
278 * The reason that we use our own function here is that we need to
279 * start transactions before we grab page locks. This allows us
280 * to get the ordering right.
281 */
282
gfs2_write_cache_jdata(struct address_space * mapping,struct writeback_control * wbc)283 static int gfs2_write_cache_jdata(struct address_space *mapping,
284 struct writeback_control *wbc)
285 {
286 int ret = 0;
287 int done = 0;
288 struct folio_batch fbatch;
289 int nr_folios;
290 pgoff_t writeback_index;
291 pgoff_t index;
292 pgoff_t end;
293 pgoff_t done_index;
294 int cycled;
295 int range_whole = 0;
296 xa_mark_t tag;
297
298 folio_batch_init(&fbatch);
299 if (wbc->range_cyclic) {
300 writeback_index = mapping->writeback_index; /* prev offset */
301 index = writeback_index;
302 if (index == 0)
303 cycled = 1;
304 else
305 cycled = 0;
306 end = -1;
307 } else {
308 index = wbc->range_start >> PAGE_SHIFT;
309 end = wbc->range_end >> PAGE_SHIFT;
310 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
311 range_whole = 1;
312 cycled = 1; /* ignore range_cyclic tests */
313 }
314 tag = wbc_to_tag(wbc);
315
316 retry:
317 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
318 tag_pages_for_writeback(mapping, index, end);
319 done_index = index;
320 while (!done && (index <= end)) {
321 nr_folios = filemap_get_folios_tag(mapping, &index, end,
322 tag, &fbatch);
323 if (nr_folios == 0)
324 break;
325
326 ret = gfs2_write_jdata_batch(mapping, wbc, &fbatch,
327 &done_index);
328 if (ret)
329 done = 1;
330 if (ret > 0)
331 ret = 0;
332 folio_batch_release(&fbatch);
333 cond_resched();
334 }
335
336 if (!cycled && !done) {
337 /*
338 * range_cyclic:
339 * We hit the last page and there is more work to be done: wrap
340 * back to the start of the file
341 */
342 cycled = 1;
343 index = 0;
344 end = writeback_index - 1;
345 goto retry;
346 }
347
348 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
349 mapping->writeback_index = done_index;
350
351 return ret;
352 }
353
354
355 /**
356 * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk
357 * @mapping: The mapping to write
358 * @wbc: The writeback control
359 *
360 */
361
gfs2_jdata_writepages(struct address_space * mapping,struct writeback_control * wbc)362 static int gfs2_jdata_writepages(struct address_space *mapping,
363 struct writeback_control *wbc)
364 {
365 struct gfs2_inode *ip = GFS2_I(mapping->host);
366 struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
367 int ret;
368
369 ret = gfs2_write_cache_jdata(mapping, wbc);
370 if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) {
371 gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
372 GFS2_LFC_JDATA_WPAGES);
373 ret = gfs2_write_cache_jdata(mapping, wbc);
374 }
375 return ret;
376 }
377
378 /**
379 * stuffed_read_folio - Fill in a Linux folio with stuffed file data
380 * @ip: the inode
381 * @folio: the folio
382 *
383 * Returns: errno
384 */
stuffed_read_folio(struct gfs2_inode * ip,struct folio * folio)385 static int stuffed_read_folio(struct gfs2_inode *ip, struct folio *folio)
386 {
387 struct buffer_head *dibh = NULL;
388 size_t dsize = i_size_read(&ip->i_inode);
389 void *from = NULL;
390 int error = 0;
391
392 /*
393 * Due to the order of unstuffing files and ->fault(), we can be
394 * asked for a zero folio in the case of a stuffed file being extended,
395 * so we need to supply one here. It doesn't happen often.
396 */
397 if (unlikely(folio->index)) {
398 dsize = 0;
399 } else {
400 error = gfs2_meta_inode_buffer(ip, &dibh);
401 if (error)
402 goto out;
403 from = dibh->b_data + sizeof(struct gfs2_dinode);
404 }
405
406 folio_fill_tail(folio, 0, from, dsize);
407 brelse(dibh);
408 out:
409 folio_end_read(folio, error == 0);
410
411 return error;
412 }
413
414 /**
415 * gfs2_read_folio - read a folio from a file
416 * @file: The file to read
417 * @folio: The folio in the file
418 */
gfs2_read_folio(struct file * file,struct folio * folio)419 static int gfs2_read_folio(struct file *file, struct folio *folio)
420 {
421 struct inode *inode = folio->mapping->host;
422 struct gfs2_inode *ip = GFS2_I(inode);
423 struct gfs2_sbd *sdp = GFS2_SB(inode);
424 int error = 0;
425
426 if (!gfs2_is_jdata(ip) ||
427 (i_blocksize(inode) == PAGE_SIZE && !folio_buffers(folio))) {
428 iomap_bio_read_folio(folio, &gfs2_iomap_ops);
429 } else if (gfs2_is_stuffed(ip)) {
430 error = stuffed_read_folio(ip, folio);
431 } else {
432 error = mpage_read_folio(folio, gfs2_block_map);
433 }
434
435 if (gfs2_withdrawn(sdp))
436 return -EIO;
437
438 return error;
439 }
440
441 /**
442 * gfs2_internal_read - read an internal file
443 * @ip: The gfs2 inode
444 * @buf: The buffer to fill
445 * @pos: The file position
446 * @size: The amount to read
447 *
448 */
449
gfs2_internal_read(struct gfs2_inode * ip,char * buf,loff_t * pos,size_t size)450 ssize_t gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos,
451 size_t size)
452 {
453 struct address_space *mapping = ip->i_inode.i_mapping;
454 unsigned long index = *pos >> PAGE_SHIFT;
455 size_t copied = 0;
456
457 do {
458 size_t offset, chunk;
459 struct folio *folio;
460
461 folio = read_cache_folio(mapping, index, gfs2_read_folio, NULL);
462 if (IS_ERR(folio)) {
463 if (PTR_ERR(folio) == -EINTR)
464 continue;
465 return PTR_ERR(folio);
466 }
467 offset = *pos + copied - folio_pos(folio);
468 chunk = min(size - copied, folio_size(folio) - offset);
469 memcpy_from_folio(buf + copied, folio, offset, chunk);
470 index = folio_next_index(folio);
471 folio_put(folio);
472 copied += chunk;
473 } while(copied < size);
474 (*pos) += size;
475 return size;
476 }
477
478 /**
479 * gfs2_readahead - Read a bunch of pages at once
480 * @rac: Read-ahead control structure
481 *
482 * Some notes:
483 * 1. This is only for readahead, so we can simply ignore any things
484 * which are slightly inconvenient (such as locking conflicts between
485 * the page lock and the glock) and return having done no I/O. Its
486 * obviously not something we'd want to do on too regular a basis.
487 * Any I/O we ignore at this time will be done via readpage later.
488 * 2. We don't handle stuffed files here we let readpage do the honours.
489 * 3. mpage_readahead() does most of the heavy lifting in the common case.
490 * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places.
491 */
492
gfs2_readahead(struct readahead_control * rac)493 static void gfs2_readahead(struct readahead_control *rac)
494 {
495 struct inode *inode = rac->mapping->host;
496 struct gfs2_inode *ip = GFS2_I(inode);
497
498 if (gfs2_is_stuffed(ip))
499 ;
500 else if (gfs2_is_jdata(ip))
501 mpage_readahead(rac, gfs2_block_map);
502 else
503 iomap_bio_readahead(rac, &gfs2_iomap_ops);
504 }
505
506 /**
507 * adjust_fs_space - Adjusts the free space available due to gfs2_grow
508 * @inode: the rindex inode
509 */
adjust_fs_space(struct inode * inode)510 void adjust_fs_space(struct inode *inode)
511 {
512 struct gfs2_sbd *sdp = GFS2_SB(inode);
513 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
514 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
515 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
516 struct buffer_head *m_bh;
517 u64 fs_total, new_free;
518
519 if (gfs2_trans_begin(sdp, 2 * RES_STATFS, 0) != 0)
520 return;
521
522 /* Total up the file system space, according to the latest rindex. */
523 fs_total = gfs2_ri_total(sdp);
524 if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0)
525 goto out;
526
527 spin_lock(&sdp->sd_statfs_spin);
528 gfs2_statfs_change_in(m_sc, m_bh->b_data +
529 sizeof(struct gfs2_dinode));
530 if (fs_total > (m_sc->sc_total + l_sc->sc_total))
531 new_free = fs_total - (m_sc->sc_total + l_sc->sc_total);
532 else
533 new_free = 0;
534 spin_unlock(&sdp->sd_statfs_spin);
535 fs_warn(sdp, "File system extended by %llu blocks.\n",
536 (unsigned long long)new_free);
537 gfs2_statfs_change(sdp, new_free, new_free, 0);
538
539 update_statfs(sdp, m_bh);
540 brelse(m_bh);
541 out:
542 sdp->sd_rindex_uptodate = 0;
543 gfs2_trans_end(sdp);
544 }
545
gfs2_jdata_dirty_folio(struct address_space * mapping,struct folio * folio)546 static bool gfs2_jdata_dirty_folio(struct address_space *mapping,
547 struct folio *folio)
548 {
549 if (current->journal_info)
550 folio_set_checked(folio);
551 return block_dirty_folio(mapping, folio);
552 }
553
554 /**
555 * gfs2_bmap - Block map function
556 * @mapping: Address space info
557 * @lblock: The block to map
558 *
559 * Returns: The disk address for the block or 0 on hole or error
560 */
561
gfs2_bmap(struct address_space * mapping,sector_t lblock)562 static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
563 {
564 struct gfs2_inode *ip = GFS2_I(mapping->host);
565 struct gfs2_holder i_gh;
566 sector_t dblock = 0;
567 int error;
568
569 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
570 if (error)
571 return 0;
572
573 if (!gfs2_is_stuffed(ip))
574 dblock = iomap_bmap(mapping, lblock, &gfs2_iomap_ops);
575
576 gfs2_glock_dq_uninit(&i_gh);
577
578 return dblock;
579 }
580
gfs2_discard(struct gfs2_sbd * sdp,struct buffer_head * bh)581 static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh)
582 {
583 struct gfs2_bufdata *bd;
584
585 lock_buffer(bh);
586 spin_lock(&sdp->sd_log_lock);
587 clear_buffer_dirty(bh);
588 bd = bh->b_private;
589 if (bd) {
590 if (!list_empty(&bd->bd_list) && !buffer_pinned(bh))
591 list_del_init(&bd->bd_list);
592 else {
593 spin_lock(&sdp->sd_ail_lock);
594 gfs2_remove_from_journal(bh, REMOVE_JDATA);
595 spin_unlock(&sdp->sd_ail_lock);
596 }
597 }
598 bh->b_bdev = NULL;
599 clear_buffer_mapped(bh);
600 clear_buffer_req(bh);
601 clear_buffer_new(bh);
602 spin_unlock(&sdp->sd_log_lock);
603 unlock_buffer(bh);
604 }
605
gfs2_invalidate_folio(struct folio * folio,size_t offset,size_t length)606 static void gfs2_invalidate_folio(struct folio *folio, size_t offset,
607 size_t length)
608 {
609 struct gfs2_sbd *sdp = GFS2_SB(folio->mapping->host);
610 size_t stop = offset + length;
611 int partial_page = (offset || length < folio_size(folio));
612 struct buffer_head *bh, *head;
613 unsigned long pos = 0;
614
615 BUG_ON(!folio_test_locked(folio));
616 if (!partial_page)
617 folio_clear_checked(folio);
618 head = folio_buffers(folio);
619 if (!head)
620 goto out;
621
622 bh = head;
623 do {
624 if (pos + bh->b_size > stop)
625 return;
626
627 if (offset <= pos)
628 gfs2_discard(sdp, bh);
629 pos += bh->b_size;
630 bh = bh->b_this_page;
631 } while (bh != head);
632 out:
633 if (!partial_page)
634 filemap_release_folio(folio, 0);
635 }
636
637 /**
638 * gfs2_release_folio - free the metadata associated with a folio
639 * @folio: the folio that's being released
640 * @gfp_mask: passed from Linux VFS, ignored by us
641 *
642 * Calls try_to_free_buffers() to free the buffers and put the folio if the
643 * buffers can be released.
644 *
645 * Returns: true if the folio was put or else false
646 */
647
gfs2_release_folio(struct folio * folio,gfp_t gfp_mask)648 bool gfs2_release_folio(struct folio *folio, gfp_t gfp_mask)
649 {
650 struct address_space *mapping = folio->mapping;
651 struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
652 struct buffer_head *bh, *head;
653 struct gfs2_bufdata *bd;
654
655 head = folio_buffers(folio);
656 if (!head)
657 return false;
658
659 /*
660 * mm accommodates an old ext3 case where clean folios might
661 * not have had the dirty bit cleared. Thus, it can send actual
662 * dirty folios to ->release_folio() via shrink_active_list().
663 *
664 * As a workaround, we skip folios that contain dirty buffers
665 * below. Once ->release_folio isn't called on dirty folios
666 * anymore, we can warn on dirty buffers like we used to here
667 * again.
668 */
669
670 spin_lock(&sdp->sd_log_lock);
671 bh = head;
672 do {
673 if (atomic_read(&bh->b_count))
674 goto cannot_release;
675 bd = bh->b_private;
676 if (bd && bd->bd_tr)
677 goto cannot_release;
678 if (buffer_dirty(bh) || WARN_ON(buffer_pinned(bh)))
679 goto cannot_release;
680 bh = bh->b_this_page;
681 } while (bh != head);
682
683 bh = head;
684 do {
685 bd = bh->b_private;
686 if (bd) {
687 gfs2_assert_warn(sdp, bd->bd_bh == bh);
688 bd->bd_bh = NULL;
689 bh->b_private = NULL;
690 /*
691 * The bd may still be queued as a revoke, in which
692 * case we must not dequeue nor free it.
693 */
694 if (!bd->bd_blkno && !list_empty(&bd->bd_list))
695 list_del_init(&bd->bd_list);
696 if (list_empty(&bd->bd_list))
697 kmem_cache_free(gfs2_bufdata_cachep, bd);
698 }
699
700 bh = bh->b_this_page;
701 } while (bh != head);
702 spin_unlock(&sdp->sd_log_lock);
703
704 return try_to_free_buffers(folio);
705
706 cannot_release:
707 spin_unlock(&sdp->sd_log_lock);
708 return false;
709 }
710
711 static const struct address_space_operations gfs2_aops = {
712 .writepages = gfs2_writepages,
713 .read_folio = gfs2_read_folio,
714 .readahead = gfs2_readahead,
715 .dirty_folio = iomap_dirty_folio,
716 .release_folio = iomap_release_folio,
717 .invalidate_folio = iomap_invalidate_folio,
718 .bmap = gfs2_bmap,
719 .migrate_folio = filemap_migrate_folio,
720 .is_partially_uptodate = iomap_is_partially_uptodate,
721 .error_remove_folio = generic_error_remove_folio,
722 };
723
724 static const struct address_space_operations gfs2_jdata_aops = {
725 .writepages = gfs2_jdata_writepages,
726 .read_folio = gfs2_read_folio,
727 .readahead = gfs2_readahead,
728 .dirty_folio = gfs2_jdata_dirty_folio,
729 .bmap = gfs2_bmap,
730 .migrate_folio = buffer_migrate_folio,
731 .invalidate_folio = gfs2_invalidate_folio,
732 .release_folio = gfs2_release_folio,
733 .is_partially_uptodate = block_is_partially_uptodate,
734 .error_remove_folio = generic_error_remove_folio,
735 };
736
gfs2_set_aops(struct inode * inode)737 void gfs2_set_aops(struct inode *inode)
738 {
739 if (gfs2_is_jdata(GFS2_I(inode)))
740 inode->i_mapping->a_ops = &gfs2_jdata_aops;
741 else
742 inode->i_mapping->a_ops = &gfs2_aops;
743 }
744