blob: 55206fab7b994e18fb026ca36269e3feeb2705a1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * mm/truncate.c - code for taking down pages from address_spaces
3 *
4 * Copyright (C) 2002, Linus Torvalds
5 *
Francois Camie1f8e872008-10-15 22:01:59 -07006 * 10Sep2002 Andrew Morton
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * Initial version.
8 */
9
10#include <linux/kernel.h>
Alexey Dobriyan4af3c9c2007-10-16 23:29:23 -070011#include <linux/backing-dev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/mm.h>
Nick Piggin0fd0e6b2006-09-27 01:50:02 -070013#include <linux/swap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/module.h>
15#include <linux/pagemap.h>
Nate Diller01f27052007-05-09 02:35:07 -070016#include <linux/highmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/pagevec.h>
Andrew Mortone08748c2006-12-10 02:19:31 -080018#include <linux/task_io_accounting_ops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/buffer_head.h> /* grr. try_to_release_page,
Jan Karaaaa40592005-10-30 15:00:16 -080020 do_invalidatepage */
Rik van Rielba470de2008-10-18 20:26:50 -070021#include "internal.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23
David Howellscf9a2ae2006-08-29 19:05:54 +010024/**
Fengguang Wu28bc44d2008-02-03 18:04:10 +020025 * do_invalidatepage - invalidate part or all of a page
David Howellscf9a2ae2006-08-29 19:05:54 +010026 * @page: the page which is affected
27 * @offset: the index of the truncation point
28 *
29 * do_invalidatepage() is called when all or part of the page has become
30 * invalidated by a truncate operation.
31 *
32 * do_invalidatepage() does not have to release all buffers, but it must
33 * ensure that no dirty buffer is left outside @offset and that no I/O
34 * is underway against any of the blocks which are outside the truncation
35 * point. Because the caller is about to free (and possibly reuse) those
36 * blocks on-disk.
37 */
38void do_invalidatepage(struct page *page, unsigned long offset)
39{
40 void (*invalidatepage)(struct page *, unsigned long);
41 invalidatepage = page->mapping->a_ops->invalidatepage;
David Howells93614012006-09-30 20:45:40 +020042#ifdef CONFIG_BLOCK
David Howellscf9a2ae2006-08-29 19:05:54 +010043 if (!invalidatepage)
44 invalidatepage = block_invalidatepage;
David Howells93614012006-09-30 20:45:40 +020045#endif
David Howellscf9a2ae2006-08-29 19:05:54 +010046 if (invalidatepage)
47 (*invalidatepage)(page, offset);
48}
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050static inline void truncate_partial_page(struct page *page, unsigned partial)
51{
Christoph Lametereebd2aa2008-02-04 22:28:29 -080052 zero_user_segment(page, partial, PAGE_CACHE_SIZE);
David Howells266cf652009-04-03 16:42:36 +010053 if (page_has_private(page))
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 do_invalidatepage(page, partial);
55}
56
Linus Torvaldsecdfc972007-01-26 12:47:06 -080057/*
58 * This cancels just the dirty bit on the kernel page itself, it
59 * does NOT actually remove dirty bits on any mmap's that may be
60 * around. It also leaves the page tagged dirty, so any sync
61 * activity will still find it on the dirty lists, and in particular,
62 * clear_page_dirty_for_io() will still look at the dirty bits in
63 * the VM.
64 *
65 * Doing this should *normally* only ever be done when a page
66 * is truncated, and is not actually mapped anywhere at all. However,
67 * fs/buffer.c does this when it notices that somebody has cleaned
68 * out all the buffers on a page without actually doing it through
69 * the VM. Can you say "ext3 is horribly ugly"? Tought you could.
70 */
Linus Torvaldsfba25912006-12-20 13:46:42 -080071void cancel_dirty_page(struct page *page, unsigned int account_size)
72{
Linus Torvalds8368e322006-12-23 09:25:04 -080073 if (TestClearPageDirty(page)) {
74 struct address_space *mapping = page->mapping;
75 if (mapping && mapping_cap_account_dirty(mapping)) {
76 dec_zone_page_state(page, NR_FILE_DIRTY);
Peter Zijlstrac9e51e42007-10-16 23:25:47 -070077 dec_bdi_stat(mapping->backing_dev_info,
78 BDI_RECLAIMABLE);
Linus Torvalds8368e322006-12-23 09:25:04 -080079 if (account_size)
80 task_io_account_cancelled_write(account_size);
81 }
Andrew Morton3e67c092006-12-21 11:00:33 -080082 }
Linus Torvaldsfba25912006-12-20 13:46:42 -080083}
Linus Torvalds8368e322006-12-23 09:25:04 -080084EXPORT_SYMBOL(cancel_dirty_page);
Linus Torvaldsfba25912006-12-20 13:46:42 -080085
Linus Torvalds1da177e2005-04-16 15:20:36 -070086/*
87 * If truncate cannot remove the fs-private metadata from the page, the page
Shaohua Li62e1c552008-02-04 22:29:33 -080088 * becomes orphaned. It will be left on the LRU and may even be mapped into
Nick Piggin54cb8822007-07-19 01:46:59 -070089 * user pagetables if we're racing with filemap_fault().
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 *
91 * We need to bale out if page->mapping is no longer equal to the original
92 * mapping. This happens a) when the VM reclaimed the page while we waited on
Andrew Mortonfc0ecff2007-02-10 01:45:39 -080093 * its lock, b) when a concurrent invalidate_mapping_pages got there first and
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 * c) when tmpfs swizzles a page between a tmpfs inode and swapper_space.
95 */
96static void
97truncate_complete_page(struct address_space *mapping, struct page *page)
98{
99 if (page->mapping != mapping)
100 return;
101
David Howells266cf652009-04-03 16:42:36 +0100102 if (page_has_private(page))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 do_invalidatepage(page, 0);
104
Bjorn Steinbrinka2b34562008-02-04 22:29:28 -0800105 cancel_dirty_page(page, PAGE_CACHE_SIZE);
106
Rik van Rielba470de2008-10-18 20:26:50 -0700107 clear_page_mlock(page);
Nick Piggin787d2212007-07-17 04:03:34 -0700108 remove_from_page_cache(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 ClearPageMappedToDisk(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 page_cache_release(page); /* pagecache ref */
111}
112
113/*
Andrew Mortonfc0ecff2007-02-10 01:45:39 -0800114 * This is for invalidate_mapping_pages(). That function can be called at
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 * any time, and is not supposed to throw away dirty pages. But pages can
Nick Piggin0fd0e6b2006-09-27 01:50:02 -0700116 * be marked dirty at any time too, so use remove_mapping which safely
117 * discards clean, unused pages.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 *
119 * Returns non-zero if the page was successfully invalidated.
120 */
121static int
122invalidate_complete_page(struct address_space *mapping, struct page *page)
123{
Nick Piggin0fd0e6b2006-09-27 01:50:02 -0700124 int ret;
125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 if (page->mapping != mapping)
127 return 0;
128
David Howells266cf652009-04-03 16:42:36 +0100129 if (page_has_private(page) && !try_to_release_page(page, 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 return 0;
131
Rik van Rielba470de2008-10-18 20:26:50 -0700132 clear_page_mlock(page);
Nick Piggin0fd0e6b2006-09-27 01:50:02 -0700133 ret = remove_mapping(mapping, page);
Nick Piggin0fd0e6b2006-09-27 01:50:02 -0700134
135 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136}
137
138/**
Randy Dunlap06432452008-02-29 22:03:15 -0800139 * truncate_inode_pages - truncate range of pages specified by start & end byte offsets
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 * @mapping: mapping to truncate
141 * @lstart: offset from which to truncate
Hans Reiserd7339072006-01-06 00:10:36 -0800142 * @lend: offset to which to truncate
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 *
Hans Reiserd7339072006-01-06 00:10:36 -0800144 * Truncate the page cache, removing the pages that are between
145 * specified offsets (and zeroing out partial page
146 * (if lstart is not page aligned)).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 *
148 * Truncate takes two passes - the first pass is nonblocking. It will not
149 * block on page locks and it will not block on writeback. The second pass
150 * will wait. This is to prevent as much IO as possible in the affected region.
151 * The first pass will remove most pages, so the search cost of the second pass
152 * is low.
153 *
154 * When looking at page->index outside the page lock we need to be careful to
155 * copy it into a local to avoid races (it could change at any time).
156 *
157 * We pass down the cache-hot hint to the page freeing code. Even if the
158 * mapping is large, it is probably the case that the final pages are the most
159 * recently touched, and freeing happens in ascending file offset order.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 */
Hans Reiserd7339072006-01-06 00:10:36 -0800161void truncate_inode_pages_range(struct address_space *mapping,
162 loff_t lstart, loff_t lend)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163{
164 const pgoff_t start = (lstart + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT;
Hans Reiserd7339072006-01-06 00:10:36 -0800165 pgoff_t end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 const unsigned partial = lstart & (PAGE_CACHE_SIZE - 1);
167 struct pagevec pvec;
168 pgoff_t next;
169 int i;
170
171 if (mapping->nrpages == 0)
172 return;
173
Hans Reiserd7339072006-01-06 00:10:36 -0800174 BUG_ON((lend & (PAGE_CACHE_SIZE - 1)) != (PAGE_CACHE_SIZE - 1));
175 end = (lend >> PAGE_CACHE_SHIFT);
176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 pagevec_init(&pvec, 0);
178 next = start;
Hans Reiserd7339072006-01-06 00:10:36 -0800179 while (next <= end &&
180 pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 for (i = 0; i < pagevec_count(&pvec); i++) {
182 struct page *page = pvec.pages[i];
183 pgoff_t page_index = page->index;
184
Hans Reiserd7339072006-01-06 00:10:36 -0800185 if (page_index > end) {
186 next = page_index;
187 break;
188 }
189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 if (page_index > next)
191 next = page_index;
192 next++;
Nick Piggin529ae9a2008-08-02 12:01:03 +0200193 if (!trylock_page(page))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 continue;
195 if (PageWriteback(page)) {
196 unlock_page(page);
197 continue;
198 }
Nick Piggind00806b2007-07-19 01:46:57 -0700199 if (page_mapped(page)) {
200 unmap_mapping_range(mapping,
201 (loff_t)page_index<<PAGE_CACHE_SHIFT,
202 PAGE_CACHE_SIZE, 0);
203 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 truncate_complete_page(mapping, page);
205 unlock_page(page);
206 }
207 pagevec_release(&pvec);
208 cond_resched();
209 }
210
211 if (partial) {
212 struct page *page = find_lock_page(mapping, start - 1);
213 if (page) {
214 wait_on_page_writeback(page);
215 truncate_partial_page(page, partial);
216 unlock_page(page);
217 page_cache_release(page);
218 }
219 }
220
221 next = start;
222 for ( ; ; ) {
223 cond_resched();
224 if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
225 if (next == start)
226 break;
227 next = start;
228 continue;
229 }
Hans Reiserd7339072006-01-06 00:10:36 -0800230 if (pvec.pages[0]->index > end) {
231 pagevec_release(&pvec);
232 break;
233 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 for (i = 0; i < pagevec_count(&pvec); i++) {
235 struct page *page = pvec.pages[i];
236
Hans Reiserd7339072006-01-06 00:10:36 -0800237 if (page->index > end)
238 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 lock_page(page);
240 wait_on_page_writeback(page);
Nick Piggind00806b2007-07-19 01:46:57 -0700241 if (page_mapped(page)) {
242 unmap_mapping_range(mapping,
243 (loff_t)page->index<<PAGE_CACHE_SHIFT,
244 PAGE_CACHE_SIZE, 0);
245 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 if (page->index > next)
247 next = page->index;
248 next++;
249 truncate_complete_page(mapping, page);
250 unlock_page(page);
251 }
252 pagevec_release(&pvec);
253 }
254}
Hans Reiserd7339072006-01-06 00:10:36 -0800255EXPORT_SYMBOL(truncate_inode_pages_range);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
Hans Reiserd7339072006-01-06 00:10:36 -0800257/**
258 * truncate_inode_pages - truncate *all* the pages from an offset
259 * @mapping: mapping to truncate
260 * @lstart: offset from which to truncate
261 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800262 * Called under (and serialised by) inode->i_mutex.
Hans Reiserd7339072006-01-06 00:10:36 -0800263 */
264void truncate_inode_pages(struct address_space *mapping, loff_t lstart)
265{
266 truncate_inode_pages_range(mapping, lstart, (loff_t)-1);
267}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268EXPORT_SYMBOL(truncate_inode_pages);
269
Andrew Mortonfc9a07e2007-07-15 23:38:14 -0700270unsigned long __invalidate_mapping_pages(struct address_space *mapping,
271 pgoff_t start, pgoff_t end, bool be_atomic)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272{
273 struct pagevec pvec;
274 pgoff_t next = start;
275 unsigned long ret = 0;
276 int i;
277
278 pagevec_init(&pvec, 0);
279 while (next <= end &&
280 pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
281 for (i = 0; i < pagevec_count(&pvec); i++) {
282 struct page *page = pvec.pages[i];
NeilBrowne0f23602006-06-23 02:05:48 -0700283 pgoff_t index;
284 int lock_failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
Nick Piggin529ae9a2008-08-02 12:01:03 +0200286 lock_failed = !trylock_page(page);
NeilBrowne0f23602006-06-23 02:05:48 -0700287
288 /*
289 * We really shouldn't be looking at the ->index of an
290 * unlocked page. But we're not allowed to lock these
291 * pages. So we rely upon nobody altering the ->index
292 * of this (pinned-by-us) page.
293 */
294 index = page->index;
295 if (index > next)
296 next = index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 next++;
NeilBrowne0f23602006-06-23 02:05:48 -0700298 if (lock_failed)
299 continue;
300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 if (PageDirty(page) || PageWriteback(page))
302 goto unlock;
303 if (page_mapped(page))
304 goto unlock;
305 ret += invalidate_complete_page(mapping, page);
306unlock:
307 unlock_page(page);
308 if (next > end)
309 break;
310 }
311 pagevec_release(&pvec);
Andrew Mortonfc9a07e2007-07-15 23:38:14 -0700312 if (likely(!be_atomic))
313 cond_resched();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 }
315 return ret;
316}
Andrew Mortonfc9a07e2007-07-15 23:38:14 -0700317
318/**
319 * invalidate_mapping_pages - Invalidate all the unlocked pages of one inode
320 * @mapping: the address_space which holds the pages to invalidate
321 * @start: the offset 'from' which to invalidate
322 * @end: the offset 'to' which to invalidate (inclusive)
323 *
324 * This function only removes the unlocked pages, if you want to
325 * remove all the pages of one inode, you must call truncate_inode_pages.
326 *
327 * invalidate_mapping_pages() will not block on IO activity. It will not
328 * invalidate pages which are dirty, locked, under writeback or mapped into
329 * pagetables.
330 */
331unsigned long invalidate_mapping_pages(struct address_space *mapping,
332 pgoff_t start, pgoff_t end)
333{
334 return __invalidate_mapping_pages(mapping, start, end, false);
335}
Anton Altaparmakov54bc4852007-02-10 01:45:38 -0800336EXPORT_SYMBOL(invalidate_mapping_pages);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
Andrew Mortonbd4c8ce2006-09-30 23:29:29 -0700338/*
339 * This is like invalidate_complete_page(), except it ignores the page's
340 * refcount. We do this because invalidate_inode_pages2() needs stronger
341 * invalidation guarantees, and cannot afford to leave pages behind because
Anderson Briglia2706a1b2007-07-15 23:38:09 -0700342 * shrink_page_list() has a temp ref on them, or because they're transiently
343 * sitting in the lru_cache_add() pagevecs.
Andrew Mortonbd4c8ce2006-09-30 23:29:29 -0700344 */
345static int
346invalidate_complete_page2(struct address_space *mapping, struct page *page)
347{
348 if (page->mapping != mapping)
349 return 0;
350
David Howells266cf652009-04-03 16:42:36 +0100351 if (page_has_private(page) && !try_to_release_page(page, GFP_KERNEL))
Andrew Mortonbd4c8ce2006-09-30 23:29:29 -0700352 return 0;
353
Nick Piggin19fd6232008-07-25 19:45:32 -0700354 spin_lock_irq(&mapping->tree_lock);
Andrew Mortonbd4c8ce2006-09-30 23:29:29 -0700355 if (PageDirty(page))
356 goto failed;
357
Rik van Rielba470de2008-10-18 20:26:50 -0700358 clear_page_mlock(page);
David Howells266cf652009-04-03 16:42:36 +0100359 BUG_ON(page_has_private(page));
Andrew Mortonbd4c8ce2006-09-30 23:29:29 -0700360 __remove_from_page_cache(page);
Nick Piggin19fd6232008-07-25 19:45:32 -0700361 spin_unlock_irq(&mapping->tree_lock);
Andrew Mortonbd4c8ce2006-09-30 23:29:29 -0700362 page_cache_release(page); /* pagecache ref */
363 return 1;
364failed:
Nick Piggin19fd6232008-07-25 19:45:32 -0700365 spin_unlock_irq(&mapping->tree_lock);
Andrew Mortonbd4c8ce2006-09-30 23:29:29 -0700366 return 0;
367}
368
Trond Myklebuste3db7692007-01-10 23:15:39 -0800369static int do_launder_page(struct address_space *mapping, struct page *page)
370{
371 if (!PageDirty(page))
372 return 0;
373 if (page->mapping != mapping || mapping->a_ops->launder_page == NULL)
374 return 0;
375 return mapping->a_ops->launder_page(page);
376}
377
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378/**
379 * invalidate_inode_pages2_range - remove range of pages from an address_space
Martin Waitz67be2dd2005-05-01 08:59:26 -0700380 * @mapping: the address_space
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 * @start: the page offset 'from' which to invalidate
382 * @end: the page offset 'to' which to invalidate (inclusive)
383 *
384 * Any pages which are found to be mapped into pagetables are unmapped prior to
385 * invalidation.
386 *
Hisashi Hifumi6ccfa802008-09-02 14:35:40 -0700387 * Returns -EBUSY if any pages could not be invalidated.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 */
389int invalidate_inode_pages2_range(struct address_space *mapping,
390 pgoff_t start, pgoff_t end)
391{
392 struct pagevec pvec;
393 pgoff_t next;
394 int i;
395 int ret = 0;
Hisashi Hifumi0dd13342008-04-28 02:12:08 -0700396 int ret2 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 int did_range_unmap = 0;
398 int wrapped = 0;
399
400 pagevec_init(&pvec, 0);
401 next = start;
Trond Myklebust7b965e02007-02-28 20:13:55 -0800402 while (next <= end && !wrapped &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 pagevec_lookup(&pvec, mapping, next,
404 min(end - next, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) {
Trond Myklebust7b965e02007-02-28 20:13:55 -0800405 for (i = 0; i < pagevec_count(&pvec); i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 struct page *page = pvec.pages[i];
407 pgoff_t page_index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
409 lock_page(page);
410 if (page->mapping != mapping) {
411 unlock_page(page);
412 continue;
413 }
414 page_index = page->index;
415 next = page_index + 1;
416 if (next == 0)
417 wrapped = 1;
418 if (page_index > end) {
419 unlock_page(page);
420 break;
421 }
422 wait_on_page_writeback(page);
Nick Piggind00806b2007-07-19 01:46:57 -0700423 if (page_mapped(page)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 if (!did_range_unmap) {
425 /*
426 * Zap the rest of the file in one hit.
427 */
428 unmap_mapping_range(mapping,
Oleg Drokin479ef592005-11-23 13:37:47 -0800429 (loff_t)page_index<<PAGE_CACHE_SHIFT,
430 (loff_t)(end - page_index + 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 << PAGE_CACHE_SHIFT,
432 0);
433 did_range_unmap = 1;
434 } else {
435 /*
436 * Just zap this page
437 */
438 unmap_mapping_range(mapping,
Oleg Drokin479ef592005-11-23 13:37:47 -0800439 (loff_t)page_index<<PAGE_CACHE_SHIFT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 PAGE_CACHE_SIZE, 0);
441 }
442 }
Nick Piggind00806b2007-07-19 01:46:57 -0700443 BUG_ON(page_mapped(page));
Hisashi Hifumi0dd13342008-04-28 02:12:08 -0700444 ret2 = do_launder_page(mapping, page);
445 if (ret2 == 0) {
446 if (!invalidate_complete_page2(mapping, page))
Hisashi Hifumi6ccfa802008-09-02 14:35:40 -0700447 ret2 = -EBUSY;
Hisashi Hifumi0dd13342008-04-28 02:12:08 -0700448 }
449 if (ret2 < 0)
450 ret = ret2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 unlock_page(page);
452 }
453 pagevec_release(&pvec);
454 cond_resched();
455 }
456 return ret;
457}
458EXPORT_SYMBOL_GPL(invalidate_inode_pages2_range);
459
460/**
461 * invalidate_inode_pages2 - remove all pages from an address_space
Martin Waitz67be2dd2005-05-01 08:59:26 -0700462 * @mapping: the address_space
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 *
464 * Any pages which are found to be mapped into pagetables are unmapped prior to
465 * invalidation.
466 *
467 * Returns -EIO if any pages could not be invalidated.
468 */
469int invalidate_inode_pages2(struct address_space *mapping)
470{
471 return invalidate_inode_pages2_range(mapping, 0, -1);
472}
473EXPORT_SYMBOL_GPL(invalidate_inode_pages2);