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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);
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_shadow_entry(struct address_space *mapping, pgoff_t index,
28 void *entry)
29{
30 struct radix_tree_node *node;
31 void **slot;
32
33 spin_lock_irq(&mapping->tree_lock);
34 /*
35 * Regular page slots are stabilized by the page lock even
36 * without the tree itself locked. These unlocked entries
37 * need verification under the tree lock.
38 */
39 if (!__radix_tree_lookup(&mapping->page_tree, index, &node, &slot))
40 goto unlock;
41 if (*slot != entry)
42 goto unlock;
43 __radix_tree_replace(&mapping->page_tree, node, slot, NULL,
44 workingset_update_node, mapping);
45 mapping->nrexceptional--;
46unlock:
47 spin_unlock_irq(&mapping->tree_lock);
48}
49
50/*
51 * Unconditionally remove exceptional entry. Usually called from truncate path.
52 */
53static void truncate_exceptional_entry(struct address_space *mapping,
54 pgoff_t index, void *entry)
55{
56 /* Handled by shmem itself */
57 if (shmem_mapping(mapping))
58 return;
59
60 if (dax_mapping(mapping)) {
61 dax_delete_mapping_entry(mapping, index);
62 return;
63 }
64 clear_shadow_entry(mapping, index, entry);
65}
66
67/*
68 * Invalidate exceptional entry if easily possible. This handles exceptional
69 * entries for invalidate_inode_pages() so for DAX it evicts only unlocked and
70 * clean entries.
71 */
72static int invalidate_exceptional_entry(struct address_space *mapping,
73 pgoff_t index, void *entry)
74{
75 /* Handled by shmem itself */
76 if (shmem_mapping(mapping))
77 return 1;
78 if (dax_mapping(mapping))
79 return dax_invalidate_mapping_entry(mapping, index);
80 clear_shadow_entry(mapping, index, entry);
81 return 1;
82}
83
84/*
85 * Invalidate exceptional entry if clean. This handles exceptional entries for
86 * invalidate_inode_pages2() so for DAX it evicts only clean entries.
87 */
88static int invalidate_exceptional_entry2(struct address_space *mapping,
89 pgoff_t index, void *entry)
90{
91 /* Handled by shmem itself */
92 if (shmem_mapping(mapping))
93 return 1;
94 if (dax_mapping(mapping))
95 return dax_invalidate_mapping_entry_sync(mapping, index);
96 clear_shadow_entry(mapping, index, entry);
97 return 1;
98}
99
100/**
101 * do_invalidatepage - invalidate part or all of a page
102 * @page: the page which is affected
103 * @offset: start of the range to invalidate
104 * @length: length of the range to invalidate
105 *
106 * do_invalidatepage() is called when all or part of the page has become
107 * invalidated by a truncate operation.
108 *
109 * do_invalidatepage() does not have to release all buffers, but it must
110 * ensure that no dirty buffer is left outside @offset and that no I/O
111 * is underway against any of the blocks which are outside the truncation
112 * point. Because the caller is about to free (and possibly reuse) those
113 * blocks on-disk.
114 */
115void do_invalidatepage(struct page *page, unsigned int offset,
116 unsigned int length)
117{
118 void (*invalidatepage)(struct page *, unsigned int, unsigned int);
119
120 invalidatepage = page->mapping->a_ops->invalidatepage;
121#ifdef CONFIG_BLOCK
122 if (!invalidatepage)
123 invalidatepage = block_invalidatepage;
124#endif
125 if (invalidatepage)
126 (*invalidatepage)(page, offset, length);
127}
128
129/*
130 * If truncate cannot remove the fs-private metadata from the page, the page
131 * becomes orphaned. It will be left on the LRU and may even be mapped into
132 * user pagetables if we're racing with filemap_fault().
133 *
134 * We need to bale out if page->mapping is no longer equal to the original
135 * mapping. This happens a) when the VM reclaimed the page while we waited on
136 * its lock, b) when a concurrent invalidate_mapping_pages got there first and
137 * c) when tmpfs swizzles a page between a tmpfs inode and swapper_space.
138 */
139static int
140truncate_complete_page(struct address_space *mapping, struct page *page)
141{
142 if (page->mapping != mapping)
143 return -EIO;
144
145 if (page_has_private(page))
146 do_invalidatepage(page, 0, PAGE_SIZE);
147
148 /*
149 * Some filesystems seem to re-dirty the page even after
150 * the VM has canceled the dirty bit (eg ext3 journaling).
151 * Hence dirty accounting check is placed after invalidation.
152 */
153 cancel_dirty_page(page);
154 ClearPageMappedToDisk(page);
155 delete_from_page_cache(page);
156 return 0;
157}
158
159/*
160 * This is for invalidate_mapping_pages(). That function can be called at
161 * any time, and is not supposed to throw away dirty pages. But pages can
162 * be marked dirty at any time too, so use remove_mapping which safely
163 * discards clean, unused pages.
164 *
165 * Returns non-zero if the page was successfully invalidated.
166 */
167static int
168invalidate_complete_page(struct address_space *mapping, struct page *page)
169{
170 int ret;
171
172 if (page->mapping != mapping)
173 return 0;
174
175 if (page_has_private(page) && !try_to_release_page(page, 0))
176 return 0;
177
178 ret = remove_mapping(mapping, page);
179
180 return ret;
181}
182
183int truncate_inode_page(struct address_space *mapping, struct page *page)
184{
185 loff_t holelen;
186 VM_BUG_ON_PAGE(PageTail(page), page);
187
188 holelen = PageTransHuge(page) ? HPAGE_PMD_SIZE : PAGE_SIZE;
189 if (page_mapped(page)) {
190 unmap_mapping_range(mapping,
191 (loff_t)page->index << PAGE_SHIFT,
192 holelen, 0);
193 }
194 return truncate_complete_page(mapping, page);
195}
196
197/*
198 * Used to get rid of pages on hardware memory corruption.
199 */
200int generic_error_remove_page(struct address_space *mapping, struct page *page)
201{
202 if (!mapping)
203 return -EINVAL;
204 /*
205 * Only punch for normal data pages for now.
206 * Handling other types like directories would need more auditing.
207 */
208 if (!S_ISREG(mapping->host->i_mode))
209 return -EIO;
210 return truncate_inode_page(mapping, page);
211}
212EXPORT_SYMBOL(generic_error_remove_page);
213
214/*
215 * Safely invalidate one page from its pagecache mapping.
216 * It only drops clean, unused pages. The page must be locked.
217 *
218 * Returns 1 if the page is successfully invalidated, otherwise 0.
219 */
220int invalidate_inode_page(struct page *page)
221{
222 struct address_space *mapping = page_mapping(page);
223 if (!mapping)
224 return 0;
225 if (PageDirty(page) || PageWriteback(page))
226 return 0;
227 if (page_mapped(page))
228 return 0;
229 return invalidate_complete_page(mapping, page);
230}
231
232/**
233 * truncate_inode_pages_range - truncate range of pages specified by start & end byte offsets
234 * @mapping: mapping to truncate
235 * @lstart: offset from which to truncate
236 * @lend: offset to which to truncate (inclusive)
237 *
238 * Truncate the page cache, removing the pages that are between
239 * specified offsets (and zeroing out partial pages
240 * if lstart or lend + 1 is not page aligned).
241 *
242 * Truncate takes two passes - the first pass is nonblocking. It will not
243 * block on page locks and it will not block on writeback. The second pass
244 * will wait. This is to prevent as much IO as possible in the affected region.
245 * The first pass will remove most pages, so the search cost of the second pass
246 * is low.
247 *
248 * We pass down the cache-hot hint to the page freeing code. Even if the
249 * mapping is large, it is probably the case that the final pages are the most
250 * recently touched, and freeing happens in ascending file offset order.
251 *
252 * Note that since ->invalidatepage() accepts range to invalidate
253 * truncate_inode_pages_range is able to handle cases where lend + 1 is not
254 * page aligned properly.
255 */
256void truncate_inode_pages_range(struct address_space *mapping,
257 loff_t lstart, loff_t lend)
258{
259 pgoff_t start; /* inclusive */
260 pgoff_t end; /* exclusive */
261 unsigned int partial_start; /* inclusive */
262 unsigned int partial_end; /* exclusive */
263 struct pagevec pvec;
264 pgoff_t indices[PAGEVEC_SIZE];
265 pgoff_t index;
266 int i;
267
268 cleancache_invalidate_inode(mapping);
269 if (mapping->nrpages == 0 && mapping->nrexceptional == 0)
270 return;
271
272 /* Offsets within partial pages */
273 partial_start = lstart & (PAGE_SIZE - 1);
274 partial_end = (lend + 1) & (PAGE_SIZE - 1);
275
276 /*
277 * 'start' and 'end' always covers the range of pages to be fully
278 * truncated. Partial pages are covered with 'partial_start' at the
279 * start of the range and 'partial_end' at the end of the range.
280 * Note that 'end' is exclusive while 'lend' is inclusive.
281 */
282 start = (lstart + PAGE_SIZE - 1) >> PAGE_SHIFT;
283 if (lend == -1)
284 /*
285 * lend == -1 indicates end-of-file so we have to set 'end'
286 * to the highest possible pgoff_t and since the type is
287 * unsigned we're using -1.
288 */
289 end = -1;
290 else
291 end = (lend + 1) >> PAGE_SHIFT;
292
293 pagevec_init(&pvec, 0);
294 index = start;
295 while (index < end && pagevec_lookup_entries(&pvec, mapping, index,
296 min(end - index, (pgoff_t)PAGEVEC_SIZE),
297 indices)) {
298 for (i = 0; i < pagevec_count(&pvec); i++) {
299 struct page *page = pvec.pages[i];
300
301 /* We rely upon deletion not changing page->index */
302 index = indices[i];
303 if (index >= end)
304 break;
305
306 if (radix_tree_exceptional_entry(page)) {
307 truncate_exceptional_entry(mapping, index,
308 page);
309 continue;
310 }
311
312 if (!trylock_page(page))
313 continue;
314 WARN_ON(page_to_index(page) != index);
315 if (PageWriteback(page)) {
316 unlock_page(page);
317 continue;
318 }
319 truncate_inode_page(mapping, page);
320 unlock_page(page);
321 }
322 pagevec_remove_exceptionals(&pvec);
323 pagevec_release(&pvec);
324 cond_resched();
325 index++;
326 }
327
328 if (partial_start) {
329 struct page *page = find_lock_page(mapping, start - 1);
330 if (page) {
331 unsigned int top = PAGE_SIZE;
332 if (start > end) {
333 /* Truncation within a single page */
334 top = partial_end;
335 partial_end = 0;
336 }
337 wait_on_page_writeback(page);
338 zero_user_segment(page, partial_start, top);
339 cleancache_invalidate_page(mapping, page);
340 if (page_has_private(page))
341 do_invalidatepage(page, partial_start,
342 top - partial_start);
343 unlock_page(page);
344 put_page(page);
345 }
346 }
347 if (partial_end) {
348 struct page *page = find_lock_page(mapping, end);
349 if (page) {
350 wait_on_page_writeback(page);
351 zero_user_segment(page, 0, partial_end);
352 cleancache_invalidate_page(mapping, page);
353 if (page_has_private(page))
354 do_invalidatepage(page, 0,
355 partial_end);
356 unlock_page(page);
357 put_page(page);
358 }
359 }
360 /*
361 * If the truncation happened within a single page no pages
362 * will be released, just zeroed, so we can bail out now.
363 */
364 if (start >= end)
365 return;
366
367 index = start;
368 for ( ; ; ) {
369 cond_resched();
370 if (!pagevec_lookup_entries(&pvec, mapping, index,
371 min(end - index, (pgoff_t)PAGEVEC_SIZE), indices)) {
372 /* If all gone from start onwards, we're done */
373 if (index == start)
374 break;
375 /* Otherwise restart to make sure all gone */
376 index = start;
377 continue;
378 }
379 if (index == start && indices[0] >= end) {
380 /* All gone out of hole to be punched, we're done */
381 pagevec_remove_exceptionals(&pvec);
382 pagevec_release(&pvec);
383 break;
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 if (index >= end) {
391 /* Restart punch to make sure all gone */
392 index = start - 1;
393 break;
394 }
395
396 if (radix_tree_exceptional_entry(page)) {
397 truncate_exceptional_entry(mapping, index,
398 page);
399 continue;
400 }
401
402 lock_page(page);
403 WARN_ON(page_to_index(page) != index);
404 wait_on_page_writeback(page);
405 truncate_inode_page(mapping, page);
406 unlock_page(page);
407 }
408 pagevec_remove_exceptionals(&pvec);
409 pagevec_release(&pvec);
410 index++;
411 }
412 cleancache_invalidate_inode(mapping);
413}
414EXPORT_SYMBOL(truncate_inode_pages_range);
415
416/**
417 * truncate_inode_pages - truncate *all* the pages from an offset
418 * @mapping: mapping to truncate
419 * @lstart: offset from which to truncate
420 *
421 * Called under (and serialised by) inode->i_mutex.
422 *
423 * Note: When this function returns, there can be a page in the process of
424 * deletion (inside __delete_from_page_cache()) in the specified range. Thus
425 * mapping->nrpages can be non-zero when this function returns even after
426 * truncation of the whole mapping.
427 */
428void truncate_inode_pages(struct address_space *mapping, loff_t lstart)
429{
430 truncate_inode_pages_range(mapping, lstart, (loff_t)-1);
431}
432EXPORT_SYMBOL(truncate_inode_pages);
433
434/**
435 * truncate_inode_pages_final - truncate *all* pages before inode dies
436 * @mapping: mapping to truncate
437 *
438 * Called under (and serialized by) inode->i_mutex.
439 *
440 * Filesystems have to use this in the .evict_inode path to inform the
441 * VM that this is the final truncate and the inode is going away.
442 */
443void truncate_inode_pages_final(struct address_space *mapping)
444{
445 unsigned long nrexceptional;
446 unsigned long nrpages;
447
448 /*
449 * Page reclaim can not participate in regular inode lifetime
450 * management (can't call iput()) and thus can race with the
451 * inode teardown. Tell it when the address space is exiting,
452 * so that it does not install eviction information after the
453 * final truncate has begun.
454 */
455 mapping_set_exiting(mapping);
456
457 /*
458 * When reclaim installs eviction entries, it increases
459 * nrexceptional first, then decreases nrpages. Make sure we see
460 * this in the right order or we might miss an entry.
461 */
462 nrpages = mapping->nrpages;
463 smp_rmb();
464 nrexceptional = mapping->nrexceptional;
465
466 if (nrpages || nrexceptional) {
467 /*
468 * As truncation uses a lockless tree lookup, cycle
469 * the tree lock to make sure any ongoing tree
470 * modification that does not see AS_EXITING is
471 * completed before starting the final truncate.
472 */
473 spin_lock_irq(&mapping->tree_lock);
474 spin_unlock_irq(&mapping->tree_lock);
475
476 truncate_inode_pages(mapping, 0);
477 }
478}
479EXPORT_SYMBOL(truncate_inode_pages_final);
480
481/**
482 * invalidate_mapping_pages - Invalidate all the unlocked pages of one inode
483 * @mapping: the address_space which holds the pages to invalidate
484 * @start: the offset 'from' which to invalidate
485 * @end: the offset 'to' which to invalidate (inclusive)
486 *
487 * This function only removes the unlocked pages, if you want to
488 * remove all the pages of one inode, you must call truncate_inode_pages.
489 *
490 * invalidate_mapping_pages() will not block on IO activity. It will not
491 * invalidate pages which are dirty, locked, under writeback or mapped into
492 * pagetables.
493 */
494unsigned long invalidate_mapping_pages(struct address_space *mapping,
495 pgoff_t start, pgoff_t end)
496{
497 pgoff_t indices[PAGEVEC_SIZE];
498 struct pagevec pvec;
499 pgoff_t index = start;
500 unsigned long ret;
501 unsigned long count = 0;
502 int i;
503
504 pagevec_init(&pvec, 0);
505 while (index <= end && pagevec_lookup_entries(&pvec, mapping, index,
506 min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1,
507 indices)) {
508 for (i = 0; i < pagevec_count(&pvec); i++) {
509 struct page *page = pvec.pages[i];
510
511 /* We rely upon deletion not changing page->index */
512 index = indices[i];
513 if (index > end)
514 break;
515
516 if (radix_tree_exceptional_entry(page)) {
517 invalidate_exceptional_entry(mapping, index,
518 page);
519 continue;
520 }
521
522 if (!trylock_page(page))
523 continue;
524
525 WARN_ON(page_to_index(page) != index);
526
527 /* Middle of THP: skip */
528 if (PageTransTail(page)) {
529 unlock_page(page);
530 continue;
531 } else if (PageTransHuge(page)) {
532 index += HPAGE_PMD_NR - 1;
533 i += HPAGE_PMD_NR - 1;
534 /* 'end' is in the middle of THP */
535 if (index == round_down(end, HPAGE_PMD_NR))
536 continue;
537 }
538
539 ret = invalidate_inode_page(page);
540 unlock_page(page);
541 /*
542 * Invalidation is a hint that the page is no longer
543 * of interest and try to speed up its reclaim.
544 */
545 if (!ret)
546 deactivate_file_page(page);
547 count += ret;
548 }
549 pagevec_remove_exceptionals(&pvec);
550 pagevec_release(&pvec);
551 cond_resched();
552 index++;
553 }
554 return count;
555}
556EXPORT_SYMBOL(invalidate_mapping_pages);
557
558/*
559 * This is like invalidate_complete_page(), except it ignores the page's
560 * refcount. We do this because invalidate_inode_pages2() needs stronger
561 * invalidation guarantees, and cannot afford to leave pages behind because
562 * shrink_page_list() has a temp ref on them, or because they're transiently
563 * sitting in the lru_cache_add() pagevecs.
564 */
565static int
566invalidate_complete_page2(struct address_space *mapping, struct page *page)
567{
568 unsigned long flags;
569
570 if (page->mapping != mapping)
571 return 0;
572
573 if (page_has_private(page) && !try_to_release_page(page, GFP_KERNEL))
574 return 0;
575
576 spin_lock_irqsave(&mapping->tree_lock, flags);
577 if (PageDirty(page))
578 goto failed;
579
580 BUG_ON(page_has_private(page));
581 __delete_from_page_cache(page, NULL);
582 spin_unlock_irqrestore(&mapping->tree_lock, flags);
583
584 if (mapping->a_ops->freepage)
585 mapping->a_ops->freepage(page);
586
587 put_page(page); /* pagecache ref */
588 return 1;
589failed:
590 spin_unlock_irqrestore(&mapping->tree_lock, flags);
591 return 0;
592}
593
594static int do_launder_page(struct address_space *mapping, struct page *page)
595{
596 if (!PageDirty(page))
597 return 0;
598 if (page->mapping != mapping || mapping->a_ops->launder_page == NULL)
599 return 0;
600 return mapping->a_ops->launder_page(page);
601}
602
603/**
604 * invalidate_inode_pages2_range - remove range of pages from an address_space
605 * @mapping: the address_space
606 * @start: the page offset 'from' which to invalidate
607 * @end: the page offset 'to' which to invalidate (inclusive)
608 *
609 * Any pages which are found to be mapped into pagetables are unmapped prior to
610 * invalidation.
611 *
612 * Returns -EBUSY if any pages could not be invalidated.
613 */
614int invalidate_inode_pages2_range(struct address_space *mapping,
615 pgoff_t start, pgoff_t end)
616{
617 pgoff_t indices[PAGEVEC_SIZE];
618 struct pagevec pvec;
619 pgoff_t index;
620 int i;
621 int ret = 0;
622 int ret2 = 0;
623 int did_range_unmap = 0;
624
625 cleancache_invalidate_inode(mapping);
626 pagevec_init(&pvec, 0);
627 index = start;
628 while (index <= end && pagevec_lookup_entries(&pvec, mapping, index,
629 min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1,
630 indices)) {
631 for (i = 0; i < pagevec_count(&pvec); i++) {
632 struct page *page = pvec.pages[i];
633
634 /* We rely upon deletion not changing page->index */
635 index = indices[i];
636 if (index > end)
637 break;
638
639 if (radix_tree_exceptional_entry(page)) {
640 if (!invalidate_exceptional_entry2(mapping,
641 index, page))
642 ret = -EBUSY;
643 continue;
644 }
645
646 lock_page(page);
647 WARN_ON(page_to_index(page) != index);
648 if (page->mapping != mapping) {
649 unlock_page(page);
650 continue;
651 }
652 wait_on_page_writeback(page);
653 if (page_mapped(page)) {
654 if (!did_range_unmap) {
655 /*
656 * Zap the rest of the file in one hit.
657 */
658 unmap_mapping_range(mapping,
659 (loff_t)index << PAGE_SHIFT,
660 (loff_t)(1 + end - index)
661 << PAGE_SHIFT,
662 0);
663 did_range_unmap = 1;
664 } else {
665 /*
666 * Just zap this page
667 */
668 unmap_mapping_range(mapping,
669 (loff_t)index << PAGE_SHIFT,
670 PAGE_SIZE, 0);
671 }
672 }
673 BUG_ON(page_mapped(page));
674 ret2 = do_launder_page(mapping, page);
675 if (ret2 == 0) {
676 if (!invalidate_complete_page2(mapping, page))
677 ret2 = -EBUSY;
678 }
679 if (ret2 < 0)
680 ret = ret2;
681 unlock_page(page);
682 }
683 pagevec_remove_exceptionals(&pvec);
684 pagevec_release(&pvec);
685 cond_resched();
686 index++;
687 }
688 cleancache_invalidate_inode(mapping);
689 return ret;
690}
691EXPORT_SYMBOL_GPL(invalidate_inode_pages2_range);
692
693/**
694 * invalidate_inode_pages2 - remove all pages from an address_space
695 * @mapping: the address_space
696 *
697 * Any pages which are found to be mapped into pagetables are unmapped prior to
698 * invalidation.
699 *
700 * Returns -EBUSY if any pages could not be invalidated.
701 */
702int invalidate_inode_pages2(struct address_space *mapping)
703{
704 return invalidate_inode_pages2_range(mapping, 0, -1);
705}
706EXPORT_SYMBOL_GPL(invalidate_inode_pages2);
707
708/**
709 * truncate_pagecache - unmap and remove pagecache that has been truncated
710 * @inode: inode
711 * @newsize: new file size
712 *
713 * inode's new i_size must already be written before truncate_pagecache
714 * is called.
715 *
716 * This function should typically be called before the filesystem
717 * releases resources associated with the freed range (eg. deallocates
718 * blocks). This way, pagecache will always stay logically coherent
719 * with on-disk format, and the filesystem would not have to deal with
720 * situations such as writepage being called for a page that has already
721 * had its underlying blocks deallocated.
722 */
723void truncate_pagecache(struct inode *inode, loff_t newsize)
724{
725 struct address_space *mapping = inode->i_mapping;
726 loff_t holebegin = round_up(newsize, PAGE_SIZE);
727
728 /*
729 * unmap_mapping_range is called twice, first simply for
730 * efficiency so that truncate_inode_pages does fewer
731 * single-page unmaps. However after this first call, and
732 * before truncate_inode_pages finishes, it is possible for
733 * private pages to be COWed, which remain after
734 * truncate_inode_pages finishes, hence the second
735 * unmap_mapping_range call must be made for correctness.
736 */
737 unmap_mapping_range(mapping, holebegin, 0, 1);
738 truncate_inode_pages(mapping, newsize);
739 unmap_mapping_range(mapping, holebegin, 0, 1);
740}
741EXPORT_SYMBOL(truncate_pagecache);
742
743/**
744 * truncate_setsize - update inode and pagecache for a new file size
745 * @inode: inode
746 * @newsize: new file size
747 *
748 * truncate_setsize updates i_size and performs pagecache truncation (if
749 * necessary) to @newsize. It will be typically be called from the filesystem's
750 * setattr function when ATTR_SIZE is passed in.
751 *
752 * Must be called with a lock serializing truncates and writes (generally
753 * i_mutex but e.g. xfs uses a different lock) and before all filesystem
754 * specific block truncation has been performed.
755 */
756void truncate_setsize(struct inode *inode, loff_t newsize)
757{
758 loff_t oldsize = inode->i_size;
759
760 i_size_write(inode, newsize);
761 if (newsize > oldsize)
762 pagecache_isize_extended(inode, oldsize, newsize);
763 truncate_pagecache(inode, newsize);
764}
765EXPORT_SYMBOL(truncate_setsize);
766
767/**
768 * pagecache_isize_extended - update pagecache after extension of i_size
769 * @inode: inode for which i_size was extended
770 * @from: original inode size
771 * @to: new inode size
772 *
773 * Handle extension of inode size either caused by extending truncate or by
774 * write starting after current i_size. We mark the page straddling current
775 * i_size RO so that page_mkwrite() is called on the nearest write access to
776 * the page. This way filesystem can be sure that page_mkwrite() is called on
777 * the page before user writes to the page via mmap after the i_size has been
778 * changed.
779 *
780 * The function must be called after i_size is updated so that page fault
781 * coming after we unlock the page will already see the new i_size.
782 * The function must be called while we still hold i_mutex - this not only
783 * makes sure i_size is stable but also that userspace cannot observe new
784 * i_size value before we are prepared to store mmap writes at new inode size.
785 */
786void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to)
787{
788 int bsize = 1 << inode->i_blkbits;
789 loff_t rounded_from;
790 struct page *page;
791 pgoff_t index;
792
793 WARN_ON(to > inode->i_size);
794
795 if (from >= to || bsize == PAGE_SIZE)
796 return;
797 /* Page straddling @from will not have any hole block created? */
798 rounded_from = round_up(from, bsize);
799 if (to <= rounded_from || !(rounded_from & (PAGE_SIZE - 1)))
800 return;
801
802 index = from >> PAGE_SHIFT;
803 page = find_lock_page(inode->i_mapping, index);
804 /* Page not cached? Nothing to do */
805 if (!page)
806 return;
807 /*
808 * See clear_page_dirty_for_io() for details why set_page_dirty()
809 * is needed.
810 */
811 if (page_mkclean(page))
812 set_page_dirty(page);
813 unlock_page(page);
814 put_page(page);
815}
816EXPORT_SYMBOL(pagecache_isize_extended);
817
818/**
819 * truncate_pagecache_range - unmap and remove pagecache that is hole-punched
820 * @inode: inode
821 * @lstart: offset of beginning of hole
822 * @lend: offset of last byte of hole
823 *
824 * This function should typically be called before the filesystem
825 * releases resources associated with the freed range (eg. deallocates
826 * blocks). This way, pagecache will always stay logically coherent
827 * with on-disk format, and the filesystem would not have to deal with
828 * situations such as writepage being called for a page that has already
829 * had its underlying blocks deallocated.
830 */
831void truncate_pagecache_range(struct inode *inode, loff_t lstart, loff_t lend)
832{
833 struct address_space *mapping = inode->i_mapping;
834 loff_t unmap_start = round_up(lstart, PAGE_SIZE);
835 loff_t unmap_end = round_down(1 + lend, PAGE_SIZE) - 1;
836 /*
837 * This rounding is currently just for example: unmap_mapping_range
838 * expands its hole outwards, whereas we want it to contract the hole
839 * inwards. However, existing callers of truncate_pagecache_range are
840 * doing their own page rounding first. Note that unmap_mapping_range
841 * allows holelen 0 for all, and we allow lend -1 for end of file.
842 */
843
844 /*
845 * Unlike in truncate_pagecache, unmap_mapping_range is called only
846 * once (before truncating pagecache), and without "even_cows" flag:
847 * hole-punching should not remove private COWed pages from the hole.
848 */
849 if ((u64)unmap_end > (u64)unmap_start)
850 unmap_mapping_range(mapping, unmap_start,
851 1 + unmap_end - unmap_start, 0);
852 truncate_inode_pages_range(mapping, lstart, lend);
853}
854EXPORT_SYMBOL(truncate_pagecache_range);