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1/*
2 * mm/truncate.c - code for taking down pages from address_spaces
3 *
4 * Copyright (C) 2002, Linus Torvalds
5 *
6 * 10Sep2002 Andrew Morton
7 * Initial version.
8 */
9
10#include <linux/kernel.h>
11#include <linux/backing-dev.h>
12#include <linux/dax.h>
13#include <linux/gfp.h>
14#include <linux/mm.h>
15#include <linux/swap.h>
16#include <linux/export.h>
17#include <linux/pagemap.h>
18#include <linux/highmem.h>
19#include <linux/pagevec.h>
20#include <linux/task_io_accounting_ops.h>
21#include <linux/buffer_head.h> /* grr. try_to_release_page,
22 do_invalidatepage */
23#include <linux/cleancache.h>
24#include <linux/rmap.h>
25#include "internal.h"
26
27static void clear_exceptional_entry(struct address_space *mapping,
28 pgoff_t index, void *entry)
29{
30 struct radix_tree_node *node;
31 void **slot;
32
33 /* Handled by shmem itself */
34 if (shmem_mapping(mapping))
35 return;
36
37 spin_lock_irq(&mapping->tree_lock);
38
39 if (dax_mapping(mapping)) {
40 if (radix_tree_delete_item(&mapping->page_tree, index, entry))
41 mapping->nrexceptional--;
42 } else {
43 /*
44 * Regular page slots are stabilized by the page lock even
45 * without the tree itself locked. These unlocked entries
46 * need verification under the tree lock.
47 */
48 if (!__radix_tree_lookup(&mapping->page_tree, index, &node,
49 &slot))
50 goto unlock;
51 if (*slot != entry)
52 goto unlock;
53 radix_tree_replace_slot(slot, NULL);
54 mapping->nrexceptional--;
55 if (!node)
56 goto unlock;
57 workingset_node_shadows_dec(node);
58 /*
59 * Don't track node without shadow entries.
60 *
61 * Avoid acquiring the list_lru lock if already untracked.
62 * The list_empty() test is safe as node->private_list is
63 * protected by mapping->tree_lock.
64 */
65 if (!workingset_node_shadows(node) &&
66 !list_empty(&node->private_list))
67 list_lru_del(&workingset_shadow_nodes,
68 &node->private_list);
69 __radix_tree_delete_node(&mapping->page_tree, node);
70 }
71unlock:
72 spin_unlock_irq(&mapping->tree_lock);
73}
74
75/**
76 * do_invalidatepage - invalidate part or all of a page
77 * @page: the page which is affected
78 * @offset: start of the range to invalidate
79 * @length: length of the range to invalidate
80 *
81 * do_invalidatepage() is called when all or part of the page has become
82 * invalidated by a truncate operation.
83 *
84 * do_invalidatepage() does not have to release all buffers, but it must
85 * ensure that no dirty buffer is left outside @offset and that no I/O
86 * is underway against any of the blocks which are outside the truncation
87 * point. Because the caller is about to free (and possibly reuse) those
88 * blocks on-disk.
89 */
90void do_invalidatepage(struct page *page, unsigned int offset,
91 unsigned int length)
92{
93 void (*invalidatepage)(struct page *, unsigned int, unsigned int);
94
95 invalidatepage = page->mapping->a_ops->invalidatepage;
96#ifdef CONFIG_BLOCK
97 if (!invalidatepage)
98 invalidatepage = block_invalidatepage;
99#endif
100 if (invalidatepage)
101 (*invalidatepage)(page, offset, length);
102}
103
104/*
105 * If truncate cannot remove the fs-private metadata from the page, the page
106 * becomes orphaned. It will be left on the LRU and may even be mapped into
107 * user pagetables if we're racing with filemap_fault().
108 *
109 * We need to bale out if page->mapping is no longer equal to the original
110 * mapping. This happens a) when the VM reclaimed the page while we waited on
111 * its lock, b) when a concurrent invalidate_mapping_pages got there first and
112 * c) when tmpfs swizzles a page between a tmpfs inode and swapper_space.
113 */
114static int
115truncate_complete_page(struct address_space *mapping, struct page *page)
116{
117 if (page->mapping != mapping)
118 return -EIO;
119
120 if (page_has_private(page))
121 do_invalidatepage(page, 0, PAGE_SIZE);
122
123 /*
124 * Some filesystems seem to re-dirty the page even after
125 * the VM has canceled the dirty bit (eg ext3 journaling).
126 * Hence dirty accounting check is placed after invalidation.
127 */
128 cancel_dirty_page(page);
129 ClearPageMappedToDisk(page);
130 delete_from_page_cache(page);
131 return 0;
132}
133
134/*
135 * This is for invalidate_mapping_pages(). That function can be called at
136 * any time, and is not supposed to throw away dirty pages. But pages can
137 * be marked dirty at any time too, so use remove_mapping which safely
138 * discards clean, unused pages.
139 *
140 * Returns non-zero if the page was successfully invalidated.
141 */
142static int
143invalidate_complete_page(struct address_space *mapping, struct page *page)
144{
145 int ret;
146
147 if (page->mapping != mapping)
148 return 0;
149
150 if (page_has_private(page) && !try_to_release_page(page, 0))
151 return 0;
152
153 ret = remove_mapping(mapping, page);
154
155 return ret;
156}
157
158int truncate_inode_page(struct address_space *mapping, struct page *page)
159{
160 if (page_mapped(page)) {
161 unmap_mapping_range(mapping,
162 (loff_t)page->index << PAGE_SHIFT,
163 PAGE_SIZE, 0);
164 }
165 return truncate_complete_page(mapping, page);
166}
167
168/*
169 * Used to get rid of pages on hardware memory corruption.
170 */
171int generic_error_remove_page(struct address_space *mapping, struct page *page)
172{
173 if (!mapping)
174 return -EINVAL;
175 /*
176 * Only punch for normal data pages for now.
177 * Handling other types like directories would need more auditing.
178 */
179 if (!S_ISREG(mapping->host->i_mode))
180 return -EIO;
181 return truncate_inode_page(mapping, page);
182}
183EXPORT_SYMBOL(generic_error_remove_page);
184
185/*
186 * Safely invalidate one page from its pagecache mapping.
187 * It only drops clean, unused pages. The page must be locked.
188 *
189 * Returns 1 if the page is successfully invalidated, otherwise 0.
190 */
191int invalidate_inode_page(struct page *page)
192{
193 struct address_space *mapping = page_mapping(page);
194 if (!mapping)
195 return 0;
196 if (PageDirty(page) || PageWriteback(page))
197 return 0;
198 if (page_mapped(page))
199 return 0;
200 return invalidate_complete_page(mapping, page);
201}
202
203/**
204 * truncate_inode_pages_range - truncate range of pages specified by start & end byte offsets
205 * @mapping: mapping to truncate
206 * @lstart: offset from which to truncate
207 * @lend: offset to which to truncate (inclusive)
208 *
209 * Truncate the page cache, removing the pages that are between
210 * specified offsets (and zeroing out partial pages
211 * if lstart or lend + 1 is not page aligned).
212 *
213 * Truncate takes two passes - the first pass is nonblocking. It will not
214 * block on page locks and it will not block on writeback. The second pass
215 * will wait. This is to prevent as much IO as possible in the affected region.
216 * The first pass will remove most pages, so the search cost of the second pass
217 * is low.
218 *
219 * We pass down the cache-hot hint to the page freeing code. Even if the
220 * mapping is large, it is probably the case that the final pages are the most
221 * recently touched, and freeing happens in ascending file offset order.
222 *
223 * Note that since ->invalidatepage() accepts range to invalidate
224 * truncate_inode_pages_range is able to handle cases where lend + 1 is not
225 * page aligned properly.
226 */
227void truncate_inode_pages_range(struct address_space *mapping,
228 loff_t lstart, loff_t lend)
229{
230 pgoff_t start; /* inclusive */
231 pgoff_t end; /* exclusive */
232 unsigned int partial_start; /* inclusive */
233 unsigned int partial_end; /* exclusive */
234 struct pagevec pvec;
235 pgoff_t indices[PAGEVEC_SIZE];
236 pgoff_t index;
237 int i;
238
239 cleancache_invalidate_inode(mapping);
240 if (mapping->nrpages == 0 && mapping->nrexceptional == 0)
241 return;
242
243 /* Offsets within partial pages */
244 partial_start = lstart & (PAGE_SIZE - 1);
245 partial_end = (lend + 1) & (PAGE_SIZE - 1);
246
247 /*
248 * 'start' and 'end' always covers the range of pages to be fully
249 * truncated. Partial pages are covered with 'partial_start' at the
250 * start of the range and 'partial_end' at the end of the range.
251 * Note that 'end' is exclusive while 'lend' is inclusive.
252 */
253 start = (lstart + PAGE_SIZE - 1) >> PAGE_SHIFT;
254 if (lend == -1)
255 /*
256 * lend == -1 indicates end-of-file so we have to set 'end'
257 * to the highest possible pgoff_t and since the type is
258 * unsigned we're using -1.
259 */
260 end = -1;
261 else
262 end = (lend + 1) >> PAGE_SHIFT;
263
264 pagevec_init(&pvec, 0);
265 index = start;
266 while (index < end && pagevec_lookup_entries(&pvec, mapping, index,
267 min(end - index, (pgoff_t)PAGEVEC_SIZE),
268 indices)) {
269 for (i = 0; i < pagevec_count(&pvec); i++) {
270 struct page *page = pvec.pages[i];
271
272 /* We rely upon deletion not changing page->index */
273 index = indices[i];
274 if (index >= end)
275 break;
276
277 if (radix_tree_exceptional_entry(page)) {
278 clear_exceptional_entry(mapping, index, page);
279 continue;
280 }
281
282 if (!trylock_page(page))
283 continue;
284 WARN_ON(page->index != index);
285 if (PageWriteback(page)) {
286 unlock_page(page);
287 continue;
288 }
289 truncate_inode_page(mapping, page);
290 unlock_page(page);
291 }
292 pagevec_remove_exceptionals(&pvec);
293 pagevec_release(&pvec);
294 cond_resched();
295 index++;
296 }
297
298 if (partial_start) {
299 struct page *page = find_lock_page(mapping, start - 1);
300 if (page) {
301 unsigned int top = PAGE_SIZE;
302 if (start > end) {
303 /* Truncation within a single page */
304 top = partial_end;
305 partial_end = 0;
306 }
307 wait_on_page_writeback(page);
308 zero_user_segment(page, partial_start, top);
309 cleancache_invalidate_page(mapping, page);
310 if (page_has_private(page))
311 do_invalidatepage(page, partial_start,
312 top - partial_start);
313 unlock_page(page);
314 put_page(page);
315 }
316 }
317 if (partial_end) {
318 struct page *page = find_lock_page(mapping, end);
319 if (page) {
320 wait_on_page_writeback(page);
321 zero_user_segment(page, 0, partial_end);
322 cleancache_invalidate_page(mapping, page);
323 if (page_has_private(page))
324 do_invalidatepage(page, 0,
325 partial_end);
326 unlock_page(page);
327 put_page(page);
328 }
329 }
330 /*
331 * If the truncation happened within a single page no pages
332 * will be released, just zeroed, so we can bail out now.
333 */
334 if (start >= end)
335 return;
336
337 index = start;
338 for ( ; ; ) {
339 cond_resched();
340 if (!pagevec_lookup_entries(&pvec, mapping, index,
341 min(end - index, (pgoff_t)PAGEVEC_SIZE), indices)) {
342 /* If all gone from start onwards, we're done */
343 if (index == start)
344 break;
345 /* Otherwise restart to make sure all gone */
346 index = start;
347 continue;
348 }
349 if (index == start && indices[0] >= end) {
350 /* All gone out of hole to be punched, we're done */
351 pagevec_remove_exceptionals(&pvec);
352 pagevec_release(&pvec);
353 break;
354 }
355 for (i = 0; i < pagevec_count(&pvec); i++) {
356 struct page *page = pvec.pages[i];
357
358 /* We rely upon deletion not changing page->index */
359 index = indices[i];
360 if (index >= end) {
361 /* Restart punch to make sure all gone */
362 index = start - 1;
363 break;
364 }
365
366 if (radix_tree_exceptional_entry(page)) {
367 clear_exceptional_entry(mapping, index, page);
368 continue;
369 }
370
371 lock_page(page);
372 WARN_ON(page->index != index);
373 wait_on_page_writeback(page);
374 truncate_inode_page(mapping, page);
375 unlock_page(page);
376 }
377 pagevec_remove_exceptionals(&pvec);
378 pagevec_release(&pvec);
379 index++;
380 }
381 cleancache_invalidate_inode(mapping);
382}
383EXPORT_SYMBOL(truncate_inode_pages_range);
384
385/**
386 * truncate_inode_pages - truncate *all* the pages from an offset
387 * @mapping: mapping to truncate
388 * @lstart: offset from which to truncate
389 *
390 * Called under (and serialised by) inode->i_mutex.
391 *
392 * Note: When this function returns, there can be a page in the process of
393 * deletion (inside __delete_from_page_cache()) in the specified range. Thus
394 * mapping->nrpages can be non-zero when this function returns even after
395 * truncation of the whole mapping.
396 */
397void truncate_inode_pages(struct address_space *mapping, loff_t lstart)
398{
399 truncate_inode_pages_range(mapping, lstart, (loff_t)-1);
400}
401EXPORT_SYMBOL(truncate_inode_pages);
402
403/**
404 * truncate_inode_pages_final - truncate *all* pages before inode dies
405 * @mapping: mapping to truncate
406 *
407 * Called under (and serialized by) inode->i_mutex.
408 *
409 * Filesystems have to use this in the .evict_inode path to inform the
410 * VM that this is the final truncate and the inode is going away.
411 */
412void truncate_inode_pages_final(struct address_space *mapping)
413{
414 unsigned long nrexceptional;
415 unsigned long nrpages;
416
417 /*
418 * Page reclaim can not participate in regular inode lifetime
419 * management (can't call iput()) and thus can race with the
420 * inode teardown. Tell it when the address space is exiting,
421 * so that it does not install eviction information after the
422 * final truncate has begun.
423 */
424 mapping_set_exiting(mapping);
425
426 /*
427 * When reclaim installs eviction entries, it increases
428 * nrexceptional first, then decreases nrpages. Make sure we see
429 * this in the right order or we might miss an entry.
430 */
431 nrpages = mapping->nrpages;
432 smp_rmb();
433 nrexceptional = mapping->nrexceptional;
434
435 if (nrpages || nrexceptional) {
436 /*
437 * As truncation uses a lockless tree lookup, cycle
438 * the tree lock to make sure any ongoing tree
439 * modification that does not see AS_EXITING is
440 * completed before starting the final truncate.
441 */
442 spin_lock_irq(&mapping->tree_lock);
443 spin_unlock_irq(&mapping->tree_lock);
444
445 truncate_inode_pages(mapping, 0);
446 }
447}
448EXPORT_SYMBOL(truncate_inode_pages_final);
449
450/**
451 * invalidate_mapping_pages - Invalidate all the unlocked pages of one inode
452 * @mapping: the address_space which holds the pages to invalidate
453 * @start: the offset 'from' which to invalidate
454 * @end: the offset 'to' which to invalidate (inclusive)
455 *
456 * This function only removes the unlocked pages, if you want to
457 * remove all the pages of one inode, you must call truncate_inode_pages.
458 *
459 * invalidate_mapping_pages() will not block on IO activity. It will not
460 * invalidate pages which are dirty, locked, under writeback or mapped into
461 * pagetables.
462 */
463unsigned long invalidate_mapping_pages(struct address_space *mapping,
464 pgoff_t start, pgoff_t end)
465{
466 pgoff_t indices[PAGEVEC_SIZE];
467 struct pagevec pvec;
468 pgoff_t index = start;
469 unsigned long ret;
470 unsigned long count = 0;
471 int i;
472
473 pagevec_init(&pvec, 0);
474 while (index <= end && pagevec_lookup_entries(&pvec, mapping, index,
475 min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1,
476 indices)) {
477 for (i = 0; i < pagevec_count(&pvec); i++) {
478 struct page *page = pvec.pages[i];
479
480 /* We rely upon deletion not changing page->index */
481 index = indices[i];
482 if (index > end)
483 break;
484
485 if (radix_tree_exceptional_entry(page)) {
486 clear_exceptional_entry(mapping, index, page);
487 continue;
488 }
489
490 if (!trylock_page(page))
491 continue;
492 WARN_ON(page->index != index);
493 ret = invalidate_inode_page(page);
494 unlock_page(page);
495 /*
496 * Invalidation is a hint that the page is no longer
497 * of interest and try to speed up its reclaim.
498 */
499 if (!ret)
500 deactivate_file_page(page);
501 count += ret;
502 }
503 pagevec_remove_exceptionals(&pvec);
504 pagevec_release(&pvec);
505 cond_resched();
506 index++;
507 }
508 return count;
509}
510EXPORT_SYMBOL(invalidate_mapping_pages);
511
512/*
513 * This is like invalidate_complete_page(), except it ignores the page's
514 * refcount. We do this because invalidate_inode_pages2() needs stronger
515 * invalidation guarantees, and cannot afford to leave pages behind because
516 * shrink_page_list() has a temp ref on them, or because they're transiently
517 * sitting in the lru_cache_add() pagevecs.
518 */
519static int
520invalidate_complete_page2(struct address_space *mapping, struct page *page)
521{
522 unsigned long flags;
523
524 if (page->mapping != mapping)
525 return 0;
526
527 if (page_has_private(page) && !try_to_release_page(page, GFP_KERNEL))
528 return 0;
529
530 spin_lock_irqsave(&mapping->tree_lock, flags);
531 if (PageDirty(page))
532 goto failed;
533
534 BUG_ON(page_has_private(page));
535 __delete_from_page_cache(page, NULL);
536 spin_unlock_irqrestore(&mapping->tree_lock, flags);
537
538 if (mapping->a_ops->freepage)
539 mapping->a_ops->freepage(page);
540
541 put_page(page); /* pagecache ref */
542 return 1;
543failed:
544 spin_unlock_irqrestore(&mapping->tree_lock, flags);
545 return 0;
546}
547
548static int do_launder_page(struct address_space *mapping, struct page *page)
549{
550 if (!PageDirty(page))
551 return 0;
552 if (page->mapping != mapping || mapping->a_ops->launder_page == NULL)
553 return 0;
554 return mapping->a_ops->launder_page(page);
555}
556
557/**
558 * invalidate_inode_pages2_range - remove range of pages from an address_space
559 * @mapping: the address_space
560 * @start: the page offset 'from' which to invalidate
561 * @end: the page offset 'to' which to invalidate (inclusive)
562 *
563 * Any pages which are found to be mapped into pagetables are unmapped prior to
564 * invalidation.
565 *
566 * Returns -EBUSY if any pages could not be invalidated.
567 */
568int invalidate_inode_pages2_range(struct address_space *mapping,
569 pgoff_t start, pgoff_t end)
570{
571 pgoff_t indices[PAGEVEC_SIZE];
572 struct pagevec pvec;
573 pgoff_t index;
574 int i;
575 int ret = 0;
576 int ret2 = 0;
577 int did_range_unmap = 0;
578
579 cleancache_invalidate_inode(mapping);
580 pagevec_init(&pvec, 0);
581 index = start;
582 while (index <= end && pagevec_lookup_entries(&pvec, mapping, index,
583 min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1,
584 indices)) {
585 for (i = 0; i < pagevec_count(&pvec); i++) {
586 struct page *page = pvec.pages[i];
587
588 /* We rely upon deletion not changing page->index */
589 index = indices[i];
590 if (index > end)
591 break;
592
593 if (radix_tree_exceptional_entry(page)) {
594 clear_exceptional_entry(mapping, index, page);
595 continue;
596 }
597
598 lock_page(page);
599 WARN_ON(page->index != index);
600 if (page->mapping != mapping) {
601 unlock_page(page);
602 continue;
603 }
604 wait_on_page_writeback(page);
605 if (page_mapped(page)) {
606 if (!did_range_unmap) {
607 /*
608 * Zap the rest of the file in one hit.
609 */
610 unmap_mapping_range(mapping,
611 (loff_t)index << PAGE_SHIFT,
612 (loff_t)(1 + end - index)
613 << PAGE_SHIFT,
614 0);
615 did_range_unmap = 1;
616 } else {
617 /*
618 * Just zap this page
619 */
620 unmap_mapping_range(mapping,
621 (loff_t)index << PAGE_SHIFT,
622 PAGE_SIZE, 0);
623 }
624 }
625 BUG_ON(page_mapped(page));
626 ret2 = do_launder_page(mapping, page);
627 if (ret2 == 0) {
628 if (!invalidate_complete_page2(mapping, page))
629 ret2 = -EBUSY;
630 }
631 if (ret2 < 0)
632 ret = ret2;
633 unlock_page(page);
634 }
635 pagevec_remove_exceptionals(&pvec);
636 pagevec_release(&pvec);
637 cond_resched();
638 index++;
639 }
640 cleancache_invalidate_inode(mapping);
641 return ret;
642}
643EXPORT_SYMBOL_GPL(invalidate_inode_pages2_range);
644
645/**
646 * invalidate_inode_pages2 - remove all pages from an address_space
647 * @mapping: the address_space
648 *
649 * Any pages which are found to be mapped into pagetables are unmapped prior to
650 * invalidation.
651 *
652 * Returns -EBUSY if any pages could not be invalidated.
653 */
654int invalidate_inode_pages2(struct address_space *mapping)
655{
656 return invalidate_inode_pages2_range(mapping, 0, -1);
657}
658EXPORT_SYMBOL_GPL(invalidate_inode_pages2);
659
660/**
661 * truncate_pagecache - unmap and remove pagecache that has been truncated
662 * @inode: inode
663 * @newsize: new file size
664 *
665 * inode's new i_size must already be written before truncate_pagecache
666 * is called.
667 *
668 * This function should typically be called before the filesystem
669 * releases resources associated with the freed range (eg. deallocates
670 * blocks). This way, pagecache will always stay logically coherent
671 * with on-disk format, and the filesystem would not have to deal with
672 * situations such as writepage being called for a page that has already
673 * had its underlying blocks deallocated.
674 */
675void truncate_pagecache(struct inode *inode, loff_t newsize)
676{
677 struct address_space *mapping = inode->i_mapping;
678 loff_t holebegin = round_up(newsize, PAGE_SIZE);
679
680 /*
681 * unmap_mapping_range is called twice, first simply for
682 * efficiency so that truncate_inode_pages does fewer
683 * single-page unmaps. However after this first call, and
684 * before truncate_inode_pages finishes, it is possible for
685 * private pages to be COWed, which remain after
686 * truncate_inode_pages finishes, hence the second
687 * unmap_mapping_range call must be made for correctness.
688 */
689 unmap_mapping_range(mapping, holebegin, 0, 1);
690 truncate_inode_pages(mapping, newsize);
691 unmap_mapping_range(mapping, holebegin, 0, 1);
692}
693EXPORT_SYMBOL(truncate_pagecache);
694
695/**
696 * truncate_setsize - update inode and pagecache for a new file size
697 * @inode: inode
698 * @newsize: new file size
699 *
700 * truncate_setsize updates i_size and performs pagecache truncation (if
701 * necessary) to @newsize. It will be typically be called from the filesystem's
702 * setattr function when ATTR_SIZE is passed in.
703 *
704 * Must be called with a lock serializing truncates and writes (generally
705 * i_mutex but e.g. xfs uses a different lock) and before all filesystem
706 * specific block truncation has been performed.
707 */
708void truncate_setsize(struct inode *inode, loff_t newsize)
709{
710 loff_t oldsize = inode->i_size;
711
712 i_size_write(inode, newsize);
713 if (newsize > oldsize)
714 pagecache_isize_extended(inode, oldsize, newsize);
715 truncate_pagecache(inode, newsize);
716}
717EXPORT_SYMBOL(truncate_setsize);
718
719/**
720 * pagecache_isize_extended - update pagecache after extension of i_size
721 * @inode: inode for which i_size was extended
722 * @from: original inode size
723 * @to: new inode size
724 *
725 * Handle extension of inode size either caused by extending truncate or by
726 * write starting after current i_size. We mark the page straddling current
727 * i_size RO so that page_mkwrite() is called on the nearest write access to
728 * the page. This way filesystem can be sure that page_mkwrite() is called on
729 * the page before user writes to the page via mmap after the i_size has been
730 * changed.
731 *
732 * The function must be called after i_size is updated so that page fault
733 * coming after we unlock the page will already see the new i_size.
734 * The function must be called while we still hold i_mutex - this not only
735 * makes sure i_size is stable but also that userspace cannot observe new
736 * i_size value before we are prepared to store mmap writes at new inode size.
737 */
738void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to)
739{
740 int bsize = 1 << inode->i_blkbits;
741 loff_t rounded_from;
742 struct page *page;
743 pgoff_t index;
744
745 WARN_ON(to > inode->i_size);
746
747 if (from >= to || bsize == PAGE_SIZE)
748 return;
749 /* Page straddling @from will not have any hole block created? */
750 rounded_from = round_up(from, bsize);
751 if (to <= rounded_from || !(rounded_from & (PAGE_SIZE - 1)))
752 return;
753
754 index = from >> PAGE_SHIFT;
755 page = find_lock_page(inode->i_mapping, index);
756 /* Page not cached? Nothing to do */
757 if (!page)
758 return;
759 /*
760 * See clear_page_dirty_for_io() for details why set_page_dirty()
761 * is needed.
762 */
763 if (page_mkclean(page))
764 set_page_dirty(page);
765 unlock_page(page);
766 put_page(page);
767}
768EXPORT_SYMBOL(pagecache_isize_extended);
769
770/**
771 * truncate_pagecache_range - unmap and remove pagecache that is hole-punched
772 * @inode: inode
773 * @lstart: offset of beginning of hole
774 * @lend: offset of last byte of hole
775 *
776 * This function should typically be called before the filesystem
777 * releases resources associated with the freed range (eg. deallocates
778 * blocks). This way, pagecache will always stay logically coherent
779 * with on-disk format, and the filesystem would not have to deal with
780 * situations such as writepage being called for a page that has already
781 * had its underlying blocks deallocated.
782 */
783void truncate_pagecache_range(struct inode *inode, loff_t lstart, loff_t lend)
784{
785 struct address_space *mapping = inode->i_mapping;
786 loff_t unmap_start = round_up(lstart, PAGE_SIZE);
787 loff_t unmap_end = round_down(1 + lend, PAGE_SIZE) - 1;
788 /*
789 * This rounding is currently just for example: unmap_mapping_range
790 * expands its hole outwards, whereas we want it to contract the hole
791 * inwards. However, existing callers of truncate_pagecache_range are
792 * doing their own page rounding first. Note that unmap_mapping_range
793 * allows holelen 0 for all, and we allow lend -1 for end of file.
794 */
795
796 /*
797 * Unlike in truncate_pagecache, unmap_mapping_range is called only
798 * once (before truncating pagecache), and without "even_cows" flag:
799 * hole-punching should not remove private COWed pages from the hole.
800 */
801 if ((u64)unmap_end > (u64)unmap_start)
802 unmap_mapping_range(mapping, unmap_start,
803 1 + unmap_end - unmap_start, 0);
804 truncate_inode_pages_range(mapping, lstart, lend);
805}
806EXPORT_SYMBOL(truncate_pagecache_range);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * mm/truncate.c - code for taking down pages from address_spaces
4 *
5 * Copyright (C) 2002, Linus Torvalds
6 *
7 * 10Sep2002 Andrew Morton
8 * Initial version.
9 */
10
11#include <linux/kernel.h>
12#include <linux/backing-dev.h>
13#include <linux/dax.h>
14#include <linux/gfp.h>
15#include <linux/mm.h>
16#include <linux/swap.h>
17#include <linux/export.h>
18#include <linux/pagemap.h>
19#include <linux/highmem.h>
20#include <linux/pagevec.h>
21#include <linux/task_io_accounting_ops.h>
22#include <linux/buffer_head.h> /* grr. try_to_release_page,
23 do_invalidatepage */
24#include <linux/shmem_fs.h>
25#include <linux/cleancache.h>
26#include <linux/rmap.h>
27#include "internal.h"
28
29/*
30 * Regular page slots are stabilized by the page lock even without the tree
31 * itself locked. These unlocked entries need verification under the tree
32 * lock.
33 */
34static inline void __clear_shadow_entry(struct address_space *mapping,
35 pgoff_t index, void *entry)
36{
37 XA_STATE(xas, &mapping->i_pages, index);
38
39 xas_set_update(&xas, workingset_update_node);
40 if (xas_load(&xas) != entry)
41 return;
42 xas_store(&xas, NULL);
43}
44
45static void clear_shadow_entry(struct address_space *mapping, pgoff_t index,
46 void *entry)
47{
48 xa_lock_irq(&mapping->i_pages);
49 __clear_shadow_entry(mapping, index, entry);
50 xa_unlock_irq(&mapping->i_pages);
51}
52
53/*
54 * Unconditionally remove exceptional entries. Usually called from truncate
55 * path. Note that the pagevec may be altered by this function by removing
56 * exceptional entries similar to what pagevec_remove_exceptionals does.
57 */
58static void truncate_exceptional_pvec_entries(struct address_space *mapping,
59 struct pagevec *pvec, pgoff_t *indices)
60{
61 int i, j;
62 bool dax;
63
64 /* Handled by shmem itself */
65 if (shmem_mapping(mapping))
66 return;
67
68 for (j = 0; j < pagevec_count(pvec); j++)
69 if (xa_is_value(pvec->pages[j]))
70 break;
71
72 if (j == pagevec_count(pvec))
73 return;
74
75 dax = dax_mapping(mapping);
76 if (!dax)
77 xa_lock_irq(&mapping->i_pages);
78
79 for (i = j; i < pagevec_count(pvec); i++) {
80 struct page *page = pvec->pages[i];
81 pgoff_t index = indices[i];
82
83 if (!xa_is_value(page)) {
84 pvec->pages[j++] = page;
85 continue;
86 }
87
88 if (unlikely(dax)) {
89 dax_delete_mapping_entry(mapping, index);
90 continue;
91 }
92
93 __clear_shadow_entry(mapping, index, page);
94 }
95
96 if (!dax)
97 xa_unlock_irq(&mapping->i_pages);
98 pvec->nr = j;
99}
100
101/*
102 * Invalidate exceptional entry if easily possible. This handles exceptional
103 * entries for invalidate_inode_pages().
104 */
105static int invalidate_exceptional_entry(struct address_space *mapping,
106 pgoff_t index, void *entry)
107{
108 /* Handled by shmem itself, or for DAX we do nothing. */
109 if (shmem_mapping(mapping) || dax_mapping(mapping))
110 return 1;
111 clear_shadow_entry(mapping, index, entry);
112 return 1;
113}
114
115/*
116 * Invalidate exceptional entry if clean. This handles exceptional entries for
117 * invalidate_inode_pages2() so for DAX it evicts only clean entries.
118 */
119static int invalidate_exceptional_entry2(struct address_space *mapping,
120 pgoff_t index, void *entry)
121{
122 /* Handled by shmem itself */
123 if (shmem_mapping(mapping))
124 return 1;
125 if (dax_mapping(mapping))
126 return dax_invalidate_mapping_entry_sync(mapping, index);
127 clear_shadow_entry(mapping, index, entry);
128 return 1;
129}
130
131/**
132 * do_invalidatepage - invalidate part or all of a page
133 * @page: the page which is affected
134 * @offset: start of the range to invalidate
135 * @length: length of the range to invalidate
136 *
137 * do_invalidatepage() is called when all or part of the page has become
138 * invalidated by a truncate operation.
139 *
140 * do_invalidatepage() does not have to release all buffers, but it must
141 * ensure that no dirty buffer is left outside @offset and that no I/O
142 * is underway against any of the blocks which are outside the truncation
143 * point. Because the caller is about to free (and possibly reuse) those
144 * blocks on-disk.
145 */
146void do_invalidatepage(struct page *page, unsigned int offset,
147 unsigned int length)
148{
149 void (*invalidatepage)(struct page *, unsigned int, unsigned int);
150
151 invalidatepage = page->mapping->a_ops->invalidatepage;
152#ifdef CONFIG_BLOCK
153 if (!invalidatepage)
154 invalidatepage = block_invalidatepage;
155#endif
156 if (invalidatepage)
157 (*invalidatepage)(page, offset, length);
158}
159
160/*
161 * If truncate cannot remove the fs-private metadata from the page, the page
162 * becomes orphaned. It will be left on the LRU and may even be mapped into
163 * user pagetables if we're racing with filemap_fault().
164 *
165 * We need to bail out if page->mapping is no longer equal to the original
166 * mapping. This happens a) when the VM reclaimed the page while we waited on
167 * its lock, b) when a concurrent invalidate_mapping_pages got there first and
168 * c) when tmpfs swizzles a page between a tmpfs inode and swapper_space.
169 */
170static void truncate_cleanup_page(struct page *page)
171{
172 if (page_mapped(page))
173 unmap_mapping_page(page);
174
175 if (page_has_private(page))
176 do_invalidatepage(page, 0, thp_size(page));
177
178 /*
179 * Some filesystems seem to re-dirty the page even after
180 * the VM has canceled the dirty bit (eg ext3 journaling).
181 * Hence dirty accounting check is placed after invalidation.
182 */
183 cancel_dirty_page(page);
184 ClearPageMappedToDisk(page);
185}
186
187/*
188 * This is for invalidate_mapping_pages(). That function can be called at
189 * any time, and is not supposed to throw away dirty pages. But pages can
190 * be marked dirty at any time too, so use remove_mapping which safely
191 * discards clean, unused pages.
192 *
193 * Returns non-zero if the page was successfully invalidated.
194 */
195static int
196invalidate_complete_page(struct address_space *mapping, struct page *page)
197{
198 int ret;
199
200 if (page->mapping != mapping)
201 return 0;
202
203 if (page_has_private(page) && !try_to_release_page(page, 0))
204 return 0;
205
206 ret = remove_mapping(mapping, page);
207
208 return ret;
209}
210
211int truncate_inode_page(struct address_space *mapping, struct page *page)
212{
213 VM_BUG_ON_PAGE(PageTail(page), page);
214
215 if (page->mapping != mapping)
216 return -EIO;
217
218 truncate_cleanup_page(page);
219 delete_from_page_cache(page);
220 return 0;
221}
222
223/*
224 * Used to get rid of pages on hardware memory corruption.
225 */
226int generic_error_remove_page(struct address_space *mapping, struct page *page)
227{
228 if (!mapping)
229 return -EINVAL;
230 /*
231 * Only punch for normal data pages for now.
232 * Handling other types like directories would need more auditing.
233 */
234 if (!S_ISREG(mapping->host->i_mode))
235 return -EIO;
236 return truncate_inode_page(mapping, page);
237}
238EXPORT_SYMBOL(generic_error_remove_page);
239
240/*
241 * Safely invalidate one page from its pagecache mapping.
242 * It only drops clean, unused pages. The page must be locked.
243 *
244 * Returns 1 if the page is successfully invalidated, otherwise 0.
245 */
246int invalidate_inode_page(struct page *page)
247{
248 struct address_space *mapping = page_mapping(page);
249 if (!mapping)
250 return 0;
251 if (PageDirty(page) || PageWriteback(page))
252 return 0;
253 if (page_mapped(page))
254 return 0;
255 return invalidate_complete_page(mapping, page);
256}
257
258/**
259 * truncate_inode_pages_range - truncate range of pages specified by start & end byte offsets
260 * @mapping: mapping to truncate
261 * @lstart: offset from which to truncate
262 * @lend: offset to which to truncate (inclusive)
263 *
264 * Truncate the page cache, removing the pages that are between
265 * specified offsets (and zeroing out partial pages
266 * if lstart or lend + 1 is not page aligned).
267 *
268 * Truncate takes two passes - the first pass is nonblocking. It will not
269 * block on page locks and it will not block on writeback. The second pass
270 * will wait. This is to prevent as much IO as possible in the affected region.
271 * The first pass will remove most pages, so the search cost of the second pass
272 * is low.
273 *
274 * We pass down the cache-hot hint to the page freeing code. Even if the
275 * mapping is large, it is probably the case that the final pages are the most
276 * recently touched, and freeing happens in ascending file offset order.
277 *
278 * Note that since ->invalidatepage() accepts range to invalidate
279 * truncate_inode_pages_range is able to handle cases where lend + 1 is not
280 * page aligned properly.
281 */
282void truncate_inode_pages_range(struct address_space *mapping,
283 loff_t lstart, loff_t lend)
284{
285 pgoff_t start; /* inclusive */
286 pgoff_t end; /* exclusive */
287 unsigned int partial_start; /* inclusive */
288 unsigned int partial_end; /* exclusive */
289 struct pagevec pvec;
290 pgoff_t indices[PAGEVEC_SIZE];
291 pgoff_t index;
292 int i;
293
294 if (mapping_empty(mapping))
295 goto out;
296
297 /* Offsets within partial pages */
298 partial_start = lstart & (PAGE_SIZE - 1);
299 partial_end = (lend + 1) & (PAGE_SIZE - 1);
300
301 /*
302 * 'start' and 'end' always covers the range of pages to be fully
303 * truncated. Partial pages are covered with 'partial_start' at the
304 * start of the range and 'partial_end' at the end of the range.
305 * Note that 'end' is exclusive while 'lend' is inclusive.
306 */
307 start = (lstart + PAGE_SIZE - 1) >> PAGE_SHIFT;
308 if (lend == -1)
309 /*
310 * lend == -1 indicates end-of-file so we have to set 'end'
311 * to the highest possible pgoff_t and since the type is
312 * unsigned we're using -1.
313 */
314 end = -1;
315 else
316 end = (lend + 1) >> PAGE_SHIFT;
317
318 pagevec_init(&pvec);
319 index = start;
320 while (index < end && find_lock_entries(mapping, index, end - 1,
321 &pvec, indices)) {
322 index = indices[pagevec_count(&pvec) - 1] + 1;
323 truncate_exceptional_pvec_entries(mapping, &pvec, indices);
324 for (i = 0; i < pagevec_count(&pvec); i++)
325 truncate_cleanup_page(pvec.pages[i]);
326 delete_from_page_cache_batch(mapping, &pvec);
327 for (i = 0; i < pagevec_count(&pvec); i++)
328 unlock_page(pvec.pages[i]);
329 pagevec_release(&pvec);
330 cond_resched();
331 }
332
333 if (partial_start) {
334 struct page *page = find_lock_page(mapping, start - 1);
335 if (page) {
336 unsigned int top = PAGE_SIZE;
337 if (start > end) {
338 /* Truncation within a single page */
339 top = partial_end;
340 partial_end = 0;
341 }
342 wait_on_page_writeback(page);
343 zero_user_segment(page, partial_start, top);
344 cleancache_invalidate_page(mapping, page);
345 if (page_has_private(page))
346 do_invalidatepage(page, partial_start,
347 top - partial_start);
348 unlock_page(page);
349 put_page(page);
350 }
351 }
352 if (partial_end) {
353 struct page *page = find_lock_page(mapping, end);
354 if (page) {
355 wait_on_page_writeback(page);
356 zero_user_segment(page, 0, partial_end);
357 cleancache_invalidate_page(mapping, page);
358 if (page_has_private(page))
359 do_invalidatepage(page, 0,
360 partial_end);
361 unlock_page(page);
362 put_page(page);
363 }
364 }
365 /*
366 * If the truncation happened within a single page no pages
367 * will be released, just zeroed, so we can bail out now.
368 */
369 if (start >= end)
370 goto out;
371
372 index = start;
373 for ( ; ; ) {
374 cond_resched();
375 if (!find_get_entries(mapping, index, end - 1, &pvec,
376 indices)) {
377 /* If all gone from start onwards, we're done */
378 if (index == start)
379 break;
380 /* Otherwise restart to make sure all gone */
381 index = start;
382 continue;
383 }
384
385 for (i = 0; i < pagevec_count(&pvec); i++) {
386 struct page *page = pvec.pages[i];
387
388 /* We rely upon deletion not changing page->index */
389 index = indices[i];
390
391 if (xa_is_value(page))
392 continue;
393
394 lock_page(page);
395 WARN_ON(page_to_index(page) != index);
396 wait_on_page_writeback(page);
397 truncate_inode_page(mapping, page);
398 unlock_page(page);
399 }
400 truncate_exceptional_pvec_entries(mapping, &pvec, indices);
401 pagevec_release(&pvec);
402 index++;
403 }
404
405out:
406 cleancache_invalidate_inode(mapping);
407}
408EXPORT_SYMBOL(truncate_inode_pages_range);
409
410/**
411 * truncate_inode_pages - truncate *all* the pages from an offset
412 * @mapping: mapping to truncate
413 * @lstart: offset from which to truncate
414 *
415 * Called under (and serialised by) inode->i_mutex.
416 *
417 * Note: When this function returns, there can be a page in the process of
418 * deletion (inside __delete_from_page_cache()) in the specified range. Thus
419 * mapping->nrpages can be non-zero when this function returns even after
420 * truncation of the whole mapping.
421 */
422void truncate_inode_pages(struct address_space *mapping, loff_t lstart)
423{
424 truncate_inode_pages_range(mapping, lstart, (loff_t)-1);
425}
426EXPORT_SYMBOL(truncate_inode_pages);
427
428/**
429 * truncate_inode_pages_final - truncate *all* pages before inode dies
430 * @mapping: mapping to truncate
431 *
432 * Called under (and serialized by) inode->i_mutex.
433 *
434 * Filesystems have to use this in the .evict_inode path to inform the
435 * VM that this is the final truncate and the inode is going away.
436 */
437void truncate_inode_pages_final(struct address_space *mapping)
438{
439 /*
440 * Page reclaim can not participate in regular inode lifetime
441 * management (can't call iput()) and thus can race with the
442 * inode teardown. Tell it when the address space is exiting,
443 * so that it does not install eviction information after the
444 * final truncate has begun.
445 */
446 mapping_set_exiting(mapping);
447
448 if (!mapping_empty(mapping)) {
449 /*
450 * As truncation uses a lockless tree lookup, cycle
451 * the tree lock to make sure any ongoing tree
452 * modification that does not see AS_EXITING is
453 * completed before starting the final truncate.
454 */
455 xa_lock_irq(&mapping->i_pages);
456 xa_unlock_irq(&mapping->i_pages);
457 }
458
459 /*
460 * Cleancache needs notification even if there are no pages or shadow
461 * entries.
462 */
463 truncate_inode_pages(mapping, 0);
464}
465EXPORT_SYMBOL(truncate_inode_pages_final);
466
467static unsigned long __invalidate_mapping_pages(struct address_space *mapping,
468 pgoff_t start, pgoff_t end, unsigned long *nr_pagevec)
469{
470 pgoff_t indices[PAGEVEC_SIZE];
471 struct pagevec pvec;
472 pgoff_t index = start;
473 unsigned long ret;
474 unsigned long count = 0;
475 int i;
476
477 pagevec_init(&pvec);
478 while (find_lock_entries(mapping, index, end, &pvec, indices)) {
479 for (i = 0; i < pagevec_count(&pvec); i++) {
480 struct page *page = pvec.pages[i];
481
482 /* We rely upon deletion not changing page->index */
483 index = indices[i];
484
485 if (xa_is_value(page)) {
486 invalidate_exceptional_entry(mapping, index,
487 page);
488 continue;
489 }
490 index += thp_nr_pages(page) - 1;
491
492 ret = invalidate_inode_page(page);
493 unlock_page(page);
494 /*
495 * Invalidation is a hint that the page is no longer
496 * of interest and try to speed up its reclaim.
497 */
498 if (!ret) {
499 deactivate_file_page(page);
500 /* It is likely on the pagevec of a remote CPU */
501 if (nr_pagevec)
502 (*nr_pagevec)++;
503 }
504 count += ret;
505 }
506 pagevec_remove_exceptionals(&pvec);
507 pagevec_release(&pvec);
508 cond_resched();
509 index++;
510 }
511 return count;
512}
513
514/**
515 * invalidate_mapping_pages - Invalidate all the unlocked pages of one inode
516 * @mapping: the address_space which holds the pages to invalidate
517 * @start: the offset 'from' which to invalidate
518 * @end: the offset 'to' which to invalidate (inclusive)
519 *
520 * This function only removes the unlocked pages, if you want to
521 * remove all the pages of one inode, you must call truncate_inode_pages.
522 *
523 * invalidate_mapping_pages() will not block on IO activity. It will not
524 * invalidate pages which are dirty, locked, under writeback or mapped into
525 * pagetables.
526 *
527 * Return: the number of the pages that were invalidated
528 */
529unsigned long invalidate_mapping_pages(struct address_space *mapping,
530 pgoff_t start, pgoff_t end)
531{
532 return __invalidate_mapping_pages(mapping, start, end, NULL);
533}
534EXPORT_SYMBOL(invalidate_mapping_pages);
535
536/**
537 * invalidate_mapping_pagevec - Invalidate all the unlocked pages of one inode
538 * @mapping: the address_space which holds the pages to invalidate
539 * @start: the offset 'from' which to invalidate
540 * @end: the offset 'to' which to invalidate (inclusive)
541 * @nr_pagevec: invalidate failed page number for caller
542 *
543 * This helper is similar to invalidate_mapping_pages(), except that it accounts
544 * for pages that are likely on a pagevec and counts them in @nr_pagevec, which
545 * will be used by the caller.
546 */
547void invalidate_mapping_pagevec(struct address_space *mapping,
548 pgoff_t start, pgoff_t end, unsigned long *nr_pagevec)
549{
550 __invalidate_mapping_pages(mapping, start, end, nr_pagevec);
551}
552
553/*
554 * This is like invalidate_complete_page(), except it ignores the page's
555 * refcount. We do this because invalidate_inode_pages2() needs stronger
556 * invalidation guarantees, and cannot afford to leave pages behind because
557 * shrink_page_list() has a temp ref on them, or because they're transiently
558 * sitting in the lru_cache_add() pagevecs.
559 */
560static int
561invalidate_complete_page2(struct address_space *mapping, struct page *page)
562{
563 unsigned long flags;
564
565 if (page->mapping != mapping)
566 return 0;
567
568 if (page_has_private(page) && !try_to_release_page(page, GFP_KERNEL))
569 return 0;
570
571 xa_lock_irqsave(&mapping->i_pages, flags);
572 if (PageDirty(page))
573 goto failed;
574
575 BUG_ON(page_has_private(page));
576 __delete_from_page_cache(page, NULL);
577 xa_unlock_irqrestore(&mapping->i_pages, flags);
578
579 if (mapping->a_ops->freepage)
580 mapping->a_ops->freepage(page);
581
582 put_page(page); /* pagecache ref */
583 return 1;
584failed:
585 xa_unlock_irqrestore(&mapping->i_pages, flags);
586 return 0;
587}
588
589static int do_launder_page(struct address_space *mapping, struct page *page)
590{
591 if (!PageDirty(page))
592 return 0;
593 if (page->mapping != mapping || mapping->a_ops->launder_page == NULL)
594 return 0;
595 return mapping->a_ops->launder_page(page);
596}
597
598/**
599 * invalidate_inode_pages2_range - remove range of pages from an address_space
600 * @mapping: the address_space
601 * @start: the page offset 'from' which to invalidate
602 * @end: the page offset 'to' which to invalidate (inclusive)
603 *
604 * Any pages which are found to be mapped into pagetables are unmapped prior to
605 * invalidation.
606 *
607 * Return: -EBUSY if any pages could not be invalidated.
608 */
609int invalidate_inode_pages2_range(struct address_space *mapping,
610 pgoff_t start, pgoff_t end)
611{
612 pgoff_t indices[PAGEVEC_SIZE];
613 struct pagevec pvec;
614 pgoff_t index;
615 int i;
616 int ret = 0;
617 int ret2 = 0;
618 int did_range_unmap = 0;
619
620 if (mapping_empty(mapping))
621 goto out;
622
623 pagevec_init(&pvec);
624 index = start;
625 while (find_get_entries(mapping, index, end, &pvec, indices)) {
626 for (i = 0; i < pagevec_count(&pvec); i++) {
627 struct page *page = pvec.pages[i];
628
629 /* We rely upon deletion not changing page->index */
630 index = indices[i];
631
632 if (xa_is_value(page)) {
633 if (!invalidate_exceptional_entry2(mapping,
634 index, page))
635 ret = -EBUSY;
636 continue;
637 }
638
639 if (!did_range_unmap && page_mapped(page)) {
640 /*
641 * If page is mapped, before taking its lock,
642 * zap the rest of the file in one hit.
643 */
644 unmap_mapping_pages(mapping, index,
645 (1 + end - index), false);
646 did_range_unmap = 1;
647 }
648
649 lock_page(page);
650 WARN_ON(page_to_index(page) != index);
651 if (page->mapping != mapping) {
652 unlock_page(page);
653 continue;
654 }
655 wait_on_page_writeback(page);
656
657 if (page_mapped(page))
658 unmap_mapping_page(page);
659 BUG_ON(page_mapped(page));
660
661 ret2 = do_launder_page(mapping, page);
662 if (ret2 == 0) {
663 if (!invalidate_complete_page2(mapping, page))
664 ret2 = -EBUSY;
665 }
666 if (ret2 < 0)
667 ret = ret2;
668 unlock_page(page);
669 }
670 pagevec_remove_exceptionals(&pvec);
671 pagevec_release(&pvec);
672 cond_resched();
673 index++;
674 }
675 /*
676 * For DAX we invalidate page tables after invalidating page cache. We
677 * could invalidate page tables while invalidating each entry however
678 * that would be expensive. And doing range unmapping before doesn't
679 * work as we have no cheap way to find whether page cache entry didn't
680 * get remapped later.
681 */
682 if (dax_mapping(mapping)) {
683 unmap_mapping_pages(mapping, start, end - start + 1, false);
684 }
685out:
686 cleancache_invalidate_inode(mapping);
687 return ret;
688}
689EXPORT_SYMBOL_GPL(invalidate_inode_pages2_range);
690
691/**
692 * invalidate_inode_pages2 - remove all pages from an address_space
693 * @mapping: the address_space
694 *
695 * Any pages which are found to be mapped into pagetables are unmapped prior to
696 * invalidation.
697 *
698 * Return: -EBUSY if any pages could not be invalidated.
699 */
700int invalidate_inode_pages2(struct address_space *mapping)
701{
702 return invalidate_inode_pages2_range(mapping, 0, -1);
703}
704EXPORT_SYMBOL_GPL(invalidate_inode_pages2);
705
706/**
707 * truncate_pagecache - unmap and remove pagecache that has been truncated
708 * @inode: inode
709 * @newsize: new file size
710 *
711 * inode's new i_size must already be written before truncate_pagecache
712 * is called.
713 *
714 * This function should typically be called before the filesystem
715 * releases resources associated with the freed range (eg. deallocates
716 * blocks). This way, pagecache will always stay logically coherent
717 * with on-disk format, and the filesystem would not have to deal with
718 * situations such as writepage being called for a page that has already
719 * had its underlying blocks deallocated.
720 */
721void truncate_pagecache(struct inode *inode, loff_t newsize)
722{
723 struct address_space *mapping = inode->i_mapping;
724 loff_t holebegin = round_up(newsize, PAGE_SIZE);
725
726 /*
727 * unmap_mapping_range is called twice, first simply for
728 * efficiency so that truncate_inode_pages does fewer
729 * single-page unmaps. However after this first call, and
730 * before truncate_inode_pages finishes, it is possible for
731 * private pages to be COWed, which remain after
732 * truncate_inode_pages finishes, hence the second
733 * unmap_mapping_range call must be made for correctness.
734 */
735 unmap_mapping_range(mapping, holebegin, 0, 1);
736 truncate_inode_pages(mapping, newsize);
737 unmap_mapping_range(mapping, holebegin, 0, 1);
738}
739EXPORT_SYMBOL(truncate_pagecache);
740
741/**
742 * truncate_setsize - update inode and pagecache for a new file size
743 * @inode: inode
744 * @newsize: new file size
745 *
746 * truncate_setsize updates i_size and performs pagecache truncation (if
747 * necessary) to @newsize. It will be typically be called from the filesystem's
748 * setattr function when ATTR_SIZE is passed in.
749 *
750 * Must be called with a lock serializing truncates and writes (generally
751 * i_mutex but e.g. xfs uses a different lock) and before all filesystem
752 * specific block truncation has been performed.
753 */
754void truncate_setsize(struct inode *inode, loff_t newsize)
755{
756 loff_t oldsize = inode->i_size;
757
758 i_size_write(inode, newsize);
759 if (newsize > oldsize)
760 pagecache_isize_extended(inode, oldsize, newsize);
761 truncate_pagecache(inode, newsize);
762}
763EXPORT_SYMBOL(truncate_setsize);
764
765/**
766 * pagecache_isize_extended - update pagecache after extension of i_size
767 * @inode: inode for which i_size was extended
768 * @from: original inode size
769 * @to: new inode size
770 *
771 * Handle extension of inode size either caused by extending truncate or by
772 * write starting after current i_size. We mark the page straddling current
773 * i_size RO so that page_mkwrite() is called on the nearest write access to
774 * the page. This way filesystem can be sure that page_mkwrite() is called on
775 * the page before user writes to the page via mmap after the i_size has been
776 * changed.
777 *
778 * The function must be called after i_size is updated so that page fault
779 * coming after we unlock the page will already see the new i_size.
780 * The function must be called while we still hold i_mutex - this not only
781 * makes sure i_size is stable but also that userspace cannot observe new
782 * i_size value before we are prepared to store mmap writes at new inode size.
783 */
784void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to)
785{
786 int bsize = i_blocksize(inode);
787 loff_t rounded_from;
788 struct page *page;
789 pgoff_t index;
790
791 WARN_ON(to > inode->i_size);
792
793 if (from >= to || bsize == PAGE_SIZE)
794 return;
795 /* Page straddling @from will not have any hole block created? */
796 rounded_from = round_up(from, bsize);
797 if (to <= rounded_from || !(rounded_from & (PAGE_SIZE - 1)))
798 return;
799
800 index = from >> PAGE_SHIFT;
801 page = find_lock_page(inode->i_mapping, index);
802 /* Page not cached? Nothing to do */
803 if (!page)
804 return;
805 /*
806 * See clear_page_dirty_for_io() for details why set_page_dirty()
807 * is needed.
808 */
809 if (page_mkclean(page))
810 set_page_dirty(page);
811 unlock_page(page);
812 put_page(page);
813}
814EXPORT_SYMBOL(pagecache_isize_extended);
815
816/**
817 * truncate_pagecache_range - unmap and remove pagecache that is hole-punched
818 * @inode: inode
819 * @lstart: offset of beginning of hole
820 * @lend: offset of last byte of hole
821 *
822 * This function should typically be called before the filesystem
823 * releases resources associated with the freed range (eg. deallocates
824 * blocks). This way, pagecache will always stay logically coherent
825 * with on-disk format, and the filesystem would not have to deal with
826 * situations such as writepage being called for a page that has already
827 * had its underlying blocks deallocated.
828 */
829void truncate_pagecache_range(struct inode *inode, loff_t lstart, loff_t lend)
830{
831 struct address_space *mapping = inode->i_mapping;
832 loff_t unmap_start = round_up(lstart, PAGE_SIZE);
833 loff_t unmap_end = round_down(1 + lend, PAGE_SIZE) - 1;
834 /*
835 * This rounding is currently just for example: unmap_mapping_range
836 * expands its hole outwards, whereas we want it to contract the hole
837 * inwards. However, existing callers of truncate_pagecache_range are
838 * doing their own page rounding first. Note that unmap_mapping_range
839 * allows holelen 0 for all, and we allow lend -1 for end of file.
840 */
841
842 /*
843 * Unlike in truncate_pagecache, unmap_mapping_range is called only
844 * once (before truncating pagecache), and without "even_cows" flag:
845 * hole-punching should not remove private COWed pages from the hole.
846 */
847 if ((u64)unmap_end > (u64)unmap_start)
848 unmap_mapping_range(mapping, unmap_start,
849 1 + unmap_end - unmap_start, 0);
850 truncate_inode_pages_range(mapping, lstart, lend);
851}
852EXPORT_SYMBOL(truncate_pagecache_range);