11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * mm/truncate.c - code for taking down pages from address_spaces 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2002, Linus Torvalds 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * 10Sep2002 akpm@zip.com.au 71da177e4SLinus Torvalds * Initial version. 81da177e4SLinus Torvalds */ 91da177e4SLinus Torvalds 101da177e4SLinus Torvalds #include <linux/kernel.h> 111da177e4SLinus Torvalds #include <linux/mm.h> 120fd0e6b0SNick Piggin #include <linux/swap.h> 131da177e4SLinus Torvalds #include <linux/module.h> 141da177e4SLinus Torvalds #include <linux/pagemap.h> 151da177e4SLinus Torvalds #include <linux/pagevec.h> 16e08748ceSAndrew Morton #include <linux/task_io_accounting_ops.h> 171da177e4SLinus Torvalds #include <linux/buffer_head.h> /* grr. try_to_release_page, 18aaa4059bSJan Kara do_invalidatepage */ 191da177e4SLinus Torvalds 201da177e4SLinus Torvalds 21cf9a2ae8SDavid Howells /** 22cf9a2ae8SDavid Howells * do_invalidatepage - invalidate part of all of a page 23cf9a2ae8SDavid Howells * @page: the page which is affected 24cf9a2ae8SDavid Howells * @offset: the index of the truncation point 25cf9a2ae8SDavid Howells * 26cf9a2ae8SDavid Howells * do_invalidatepage() is called when all or part of the page has become 27cf9a2ae8SDavid Howells * invalidated by a truncate operation. 28cf9a2ae8SDavid Howells * 29cf9a2ae8SDavid Howells * do_invalidatepage() does not have to release all buffers, but it must 30cf9a2ae8SDavid Howells * ensure that no dirty buffer is left outside @offset and that no I/O 31cf9a2ae8SDavid Howells * is underway against any of the blocks which are outside the truncation 32cf9a2ae8SDavid Howells * point. Because the caller is about to free (and possibly reuse) those 33cf9a2ae8SDavid Howells * blocks on-disk. 34cf9a2ae8SDavid Howells */ 35cf9a2ae8SDavid Howells void do_invalidatepage(struct page *page, unsigned long offset) 36cf9a2ae8SDavid Howells { 37cf9a2ae8SDavid Howells void (*invalidatepage)(struct page *, unsigned long); 38cf9a2ae8SDavid Howells invalidatepage = page->mapping->a_ops->invalidatepage; 399361401eSDavid Howells #ifdef CONFIG_BLOCK 40cf9a2ae8SDavid Howells if (!invalidatepage) 41cf9a2ae8SDavid Howells invalidatepage = block_invalidatepage; 429361401eSDavid Howells #endif 43cf9a2ae8SDavid Howells if (invalidatepage) 44cf9a2ae8SDavid Howells (*invalidatepage)(page, offset); 45cf9a2ae8SDavid Howells } 46cf9a2ae8SDavid Howells 471da177e4SLinus Torvalds static inline void truncate_partial_page(struct page *page, unsigned partial) 481da177e4SLinus Torvalds { 491da177e4SLinus Torvalds memclear_highpage_flush(page, partial, PAGE_CACHE_SIZE-partial); 501da177e4SLinus Torvalds if (PagePrivate(page)) 511da177e4SLinus Torvalds do_invalidatepage(page, partial); 521da177e4SLinus Torvalds } 531da177e4SLinus Torvalds 54*ecdfc978SLinus Torvalds /* 55*ecdfc978SLinus Torvalds * This cancels just the dirty bit on the kernel page itself, it 56*ecdfc978SLinus Torvalds * does NOT actually remove dirty bits on any mmap's that may be 57*ecdfc978SLinus Torvalds * around. It also leaves the page tagged dirty, so any sync 58*ecdfc978SLinus Torvalds * activity will still find it on the dirty lists, and in particular, 59*ecdfc978SLinus Torvalds * clear_page_dirty_for_io() will still look at the dirty bits in 60*ecdfc978SLinus Torvalds * the VM. 61*ecdfc978SLinus Torvalds * 62*ecdfc978SLinus Torvalds * Doing this should *normally* only ever be done when a page 63*ecdfc978SLinus Torvalds * is truncated, and is not actually mapped anywhere at all. However, 64*ecdfc978SLinus Torvalds * fs/buffer.c does this when it notices that somebody has cleaned 65*ecdfc978SLinus Torvalds * out all the buffers on a page without actually doing it through 66*ecdfc978SLinus Torvalds * the VM. Can you say "ext3 is horribly ugly"? Tought you could. 67*ecdfc978SLinus Torvalds */ 68fba2591bSLinus Torvalds void cancel_dirty_page(struct page *page, unsigned int account_size) 69fba2591bSLinus Torvalds { 708368e328SLinus Torvalds if (TestClearPageDirty(page)) { 718368e328SLinus Torvalds struct address_space *mapping = page->mapping; 728368e328SLinus Torvalds if (mapping && mapping_cap_account_dirty(mapping)) { 733e67c098SAndrew Morton dec_zone_page_state(page, NR_FILE_DIRTY); 748368e328SLinus Torvalds if (account_size) 75fba2591bSLinus Torvalds task_io_account_cancelled_write(account_size); 76fba2591bSLinus Torvalds } 773e67c098SAndrew Morton } 788368e328SLinus Torvalds } 798368e328SLinus Torvalds EXPORT_SYMBOL(cancel_dirty_page); 80fba2591bSLinus Torvalds 811da177e4SLinus Torvalds /* 821da177e4SLinus Torvalds * If truncate cannot remove the fs-private metadata from the page, the page 831da177e4SLinus Torvalds * becomes anonymous. It will be left on the LRU and may even be mapped into 841da177e4SLinus Torvalds * user pagetables if we're racing with filemap_nopage(). 851da177e4SLinus Torvalds * 861da177e4SLinus Torvalds * We need to bale out if page->mapping is no longer equal to the original 871da177e4SLinus Torvalds * mapping. This happens a) when the VM reclaimed the page while we waited on 881da177e4SLinus Torvalds * its lock, b) when a concurrent invalidate_inode_pages got there first and 891da177e4SLinus Torvalds * c) when tmpfs swizzles a page between a tmpfs inode and swapper_space. 901da177e4SLinus Torvalds */ 911da177e4SLinus Torvalds static void 921da177e4SLinus Torvalds truncate_complete_page(struct address_space *mapping, struct page *page) 931da177e4SLinus Torvalds { 941da177e4SLinus Torvalds if (page->mapping != mapping) 951da177e4SLinus Torvalds return; 961da177e4SLinus Torvalds 973e67c098SAndrew Morton cancel_dirty_page(page, PAGE_CACHE_SIZE); 983e67c098SAndrew Morton 991da177e4SLinus Torvalds if (PagePrivate(page)) 1001da177e4SLinus Torvalds do_invalidatepage(page, 0); 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds ClearPageUptodate(page); 1031da177e4SLinus Torvalds ClearPageMappedToDisk(page); 1041da177e4SLinus Torvalds remove_from_page_cache(page); 1051da177e4SLinus Torvalds page_cache_release(page); /* pagecache ref */ 1061da177e4SLinus Torvalds } 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds /* 1091da177e4SLinus Torvalds * This is for invalidate_inode_pages(). That function can be called at 1101da177e4SLinus Torvalds * any time, and is not supposed to throw away dirty pages. But pages can 1110fd0e6b0SNick Piggin * be marked dirty at any time too, so use remove_mapping which safely 1120fd0e6b0SNick Piggin * discards clean, unused pages. 1131da177e4SLinus Torvalds * 1141da177e4SLinus Torvalds * Returns non-zero if the page was successfully invalidated. 1151da177e4SLinus Torvalds */ 1161da177e4SLinus Torvalds static int 1171da177e4SLinus Torvalds invalidate_complete_page(struct address_space *mapping, struct page *page) 1181da177e4SLinus Torvalds { 1190fd0e6b0SNick Piggin int ret; 1200fd0e6b0SNick Piggin 1211da177e4SLinus Torvalds if (page->mapping != mapping) 1221da177e4SLinus Torvalds return 0; 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds if (PagePrivate(page) && !try_to_release_page(page, 0)) 1251da177e4SLinus Torvalds return 0; 1261da177e4SLinus Torvalds 1270fd0e6b0SNick Piggin ret = remove_mapping(mapping, page); 1280fd0e6b0SNick Piggin 1290fd0e6b0SNick Piggin return ret; 1301da177e4SLinus Torvalds } 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds /** 133d7339071SHans Reiser * truncate_inode_pages - truncate range of pages specified by start and 134d7339071SHans Reiser * end byte offsets 1351da177e4SLinus Torvalds * @mapping: mapping to truncate 1361da177e4SLinus Torvalds * @lstart: offset from which to truncate 137d7339071SHans Reiser * @lend: offset to which to truncate 1381da177e4SLinus Torvalds * 139d7339071SHans Reiser * Truncate the page cache, removing the pages that are between 140d7339071SHans Reiser * specified offsets (and zeroing out partial page 141d7339071SHans Reiser * (if lstart is not page aligned)). 1421da177e4SLinus Torvalds * 1431da177e4SLinus Torvalds * Truncate takes two passes - the first pass is nonblocking. It will not 1441da177e4SLinus Torvalds * block on page locks and it will not block on writeback. The second pass 1451da177e4SLinus Torvalds * will wait. This is to prevent as much IO as possible in the affected region. 1461da177e4SLinus Torvalds * The first pass will remove most pages, so the search cost of the second pass 1471da177e4SLinus Torvalds * is low. 1481da177e4SLinus Torvalds * 1491da177e4SLinus Torvalds * When looking at page->index outside the page lock we need to be careful to 1501da177e4SLinus Torvalds * copy it into a local to avoid races (it could change at any time). 1511da177e4SLinus Torvalds * 1521da177e4SLinus Torvalds * We pass down the cache-hot hint to the page freeing code. Even if the 1531da177e4SLinus Torvalds * mapping is large, it is probably the case that the final pages are the most 1541da177e4SLinus Torvalds * recently touched, and freeing happens in ascending file offset order. 1551da177e4SLinus Torvalds */ 156d7339071SHans Reiser void truncate_inode_pages_range(struct address_space *mapping, 157d7339071SHans Reiser loff_t lstart, loff_t lend) 1581da177e4SLinus Torvalds { 1591da177e4SLinus Torvalds const pgoff_t start = (lstart + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT; 160d7339071SHans Reiser pgoff_t end; 1611da177e4SLinus Torvalds const unsigned partial = lstart & (PAGE_CACHE_SIZE - 1); 1621da177e4SLinus Torvalds struct pagevec pvec; 1631da177e4SLinus Torvalds pgoff_t next; 1641da177e4SLinus Torvalds int i; 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds if (mapping->nrpages == 0) 1671da177e4SLinus Torvalds return; 1681da177e4SLinus Torvalds 169d7339071SHans Reiser BUG_ON((lend & (PAGE_CACHE_SIZE - 1)) != (PAGE_CACHE_SIZE - 1)); 170d7339071SHans Reiser end = (lend >> PAGE_CACHE_SHIFT); 171d7339071SHans Reiser 1721da177e4SLinus Torvalds pagevec_init(&pvec, 0); 1731da177e4SLinus Torvalds next = start; 174d7339071SHans Reiser while (next <= end && 175d7339071SHans Reiser pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { 1761da177e4SLinus Torvalds for (i = 0; i < pagevec_count(&pvec); i++) { 1771da177e4SLinus Torvalds struct page *page = pvec.pages[i]; 1781da177e4SLinus Torvalds pgoff_t page_index = page->index; 1791da177e4SLinus Torvalds 180d7339071SHans Reiser if (page_index > end) { 181d7339071SHans Reiser next = page_index; 182d7339071SHans Reiser break; 183d7339071SHans Reiser } 184d7339071SHans Reiser 1851da177e4SLinus Torvalds if (page_index > next) 1861da177e4SLinus Torvalds next = page_index; 1871da177e4SLinus Torvalds next++; 1881da177e4SLinus Torvalds if (TestSetPageLocked(page)) 1891da177e4SLinus Torvalds continue; 1901da177e4SLinus Torvalds if (PageWriteback(page)) { 1911da177e4SLinus Torvalds unlock_page(page); 1921da177e4SLinus Torvalds continue; 1931da177e4SLinus Torvalds } 1941da177e4SLinus Torvalds truncate_complete_page(mapping, page); 1951da177e4SLinus Torvalds unlock_page(page); 1961da177e4SLinus Torvalds } 1971da177e4SLinus Torvalds pagevec_release(&pvec); 1981da177e4SLinus Torvalds cond_resched(); 1991da177e4SLinus Torvalds } 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds if (partial) { 2021da177e4SLinus Torvalds struct page *page = find_lock_page(mapping, start - 1); 2031da177e4SLinus Torvalds if (page) { 2041da177e4SLinus Torvalds wait_on_page_writeback(page); 2051da177e4SLinus Torvalds truncate_partial_page(page, partial); 2061da177e4SLinus Torvalds unlock_page(page); 2071da177e4SLinus Torvalds page_cache_release(page); 2081da177e4SLinus Torvalds } 2091da177e4SLinus Torvalds } 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds next = start; 2121da177e4SLinus Torvalds for ( ; ; ) { 2131da177e4SLinus Torvalds cond_resched(); 2141da177e4SLinus Torvalds if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { 2151da177e4SLinus Torvalds if (next == start) 2161da177e4SLinus Torvalds break; 2171da177e4SLinus Torvalds next = start; 2181da177e4SLinus Torvalds continue; 2191da177e4SLinus Torvalds } 220d7339071SHans Reiser if (pvec.pages[0]->index > end) { 221d7339071SHans Reiser pagevec_release(&pvec); 222d7339071SHans Reiser break; 223d7339071SHans Reiser } 2241da177e4SLinus Torvalds for (i = 0; i < pagevec_count(&pvec); i++) { 2251da177e4SLinus Torvalds struct page *page = pvec.pages[i]; 2261da177e4SLinus Torvalds 227d7339071SHans Reiser if (page->index > end) 228d7339071SHans Reiser break; 2291da177e4SLinus Torvalds lock_page(page); 2301da177e4SLinus Torvalds wait_on_page_writeback(page); 2311da177e4SLinus Torvalds if (page->index > next) 2321da177e4SLinus Torvalds next = page->index; 2331da177e4SLinus Torvalds next++; 2341da177e4SLinus Torvalds truncate_complete_page(mapping, page); 2351da177e4SLinus Torvalds unlock_page(page); 2361da177e4SLinus Torvalds } 2371da177e4SLinus Torvalds pagevec_release(&pvec); 2381da177e4SLinus Torvalds } 2391da177e4SLinus Torvalds } 240d7339071SHans Reiser EXPORT_SYMBOL(truncate_inode_pages_range); 2411da177e4SLinus Torvalds 242d7339071SHans Reiser /** 243d7339071SHans Reiser * truncate_inode_pages - truncate *all* the pages from an offset 244d7339071SHans Reiser * @mapping: mapping to truncate 245d7339071SHans Reiser * @lstart: offset from which to truncate 246d7339071SHans Reiser * 2471b1dcc1bSJes Sorensen * Called under (and serialised by) inode->i_mutex. 248d7339071SHans Reiser */ 249d7339071SHans Reiser void truncate_inode_pages(struct address_space *mapping, loff_t lstart) 250d7339071SHans Reiser { 251d7339071SHans Reiser truncate_inode_pages_range(mapping, lstart, (loff_t)-1); 252d7339071SHans Reiser } 2531da177e4SLinus Torvalds EXPORT_SYMBOL(truncate_inode_pages); 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds /** 2561da177e4SLinus Torvalds * invalidate_mapping_pages - Invalidate all the unlocked pages of one inode 2571da177e4SLinus Torvalds * @mapping: the address_space which holds the pages to invalidate 2581da177e4SLinus Torvalds * @start: the offset 'from' which to invalidate 2591da177e4SLinus Torvalds * @end: the offset 'to' which to invalidate (inclusive) 2601da177e4SLinus Torvalds * 2611da177e4SLinus Torvalds * This function only removes the unlocked pages, if you want to 2621da177e4SLinus Torvalds * remove all the pages of one inode, you must call truncate_inode_pages. 2631da177e4SLinus Torvalds * 2641da177e4SLinus Torvalds * invalidate_mapping_pages() will not block on IO activity. It will not 2651da177e4SLinus Torvalds * invalidate pages which are dirty, locked, under writeback or mapped into 2661da177e4SLinus Torvalds * pagetables. 2671da177e4SLinus Torvalds */ 2681da177e4SLinus Torvalds unsigned long invalidate_mapping_pages(struct address_space *mapping, 2691da177e4SLinus Torvalds pgoff_t start, pgoff_t end) 2701da177e4SLinus Torvalds { 2711da177e4SLinus Torvalds struct pagevec pvec; 2721da177e4SLinus Torvalds pgoff_t next = start; 2731da177e4SLinus Torvalds unsigned long ret = 0; 2741da177e4SLinus Torvalds int i; 2751da177e4SLinus Torvalds 2761da177e4SLinus Torvalds pagevec_init(&pvec, 0); 2771da177e4SLinus Torvalds while (next <= end && 2781da177e4SLinus Torvalds pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) { 2791da177e4SLinus Torvalds for (i = 0; i < pagevec_count(&pvec); i++) { 2801da177e4SLinus Torvalds struct page *page = pvec.pages[i]; 281e0f23603SNeilBrown pgoff_t index; 282e0f23603SNeilBrown int lock_failed; 2831da177e4SLinus Torvalds 284e0f23603SNeilBrown lock_failed = TestSetPageLocked(page); 285e0f23603SNeilBrown 286e0f23603SNeilBrown /* 287e0f23603SNeilBrown * We really shouldn't be looking at the ->index of an 288e0f23603SNeilBrown * unlocked page. But we're not allowed to lock these 289e0f23603SNeilBrown * pages. So we rely upon nobody altering the ->index 290e0f23603SNeilBrown * of this (pinned-by-us) page. 291e0f23603SNeilBrown */ 292e0f23603SNeilBrown index = page->index; 293e0f23603SNeilBrown if (index > next) 294e0f23603SNeilBrown next = index; 2951da177e4SLinus Torvalds next++; 296e0f23603SNeilBrown if (lock_failed) 2971da177e4SLinus Torvalds continue; 298e0f23603SNeilBrown 2991da177e4SLinus Torvalds if (PageDirty(page) || PageWriteback(page)) 3001da177e4SLinus Torvalds goto unlock; 3011da177e4SLinus Torvalds if (page_mapped(page)) 3021da177e4SLinus Torvalds goto unlock; 3031da177e4SLinus Torvalds ret += invalidate_complete_page(mapping, page); 3041da177e4SLinus Torvalds unlock: 3051da177e4SLinus Torvalds unlock_page(page); 3061da177e4SLinus Torvalds if (next > end) 3071da177e4SLinus Torvalds break; 3081da177e4SLinus Torvalds } 3091da177e4SLinus Torvalds pagevec_release(&pvec); 3101da177e4SLinus Torvalds } 3111da177e4SLinus Torvalds return ret; 3121da177e4SLinus Torvalds } 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds unsigned long invalidate_inode_pages(struct address_space *mapping) 3151da177e4SLinus Torvalds { 3161da177e4SLinus Torvalds return invalidate_mapping_pages(mapping, 0, ~0UL); 3171da177e4SLinus Torvalds } 3181da177e4SLinus Torvalds EXPORT_SYMBOL(invalidate_inode_pages); 3191da177e4SLinus Torvalds 320bd4c8ce4SAndrew Morton /* 321bd4c8ce4SAndrew Morton * This is like invalidate_complete_page(), except it ignores the page's 322bd4c8ce4SAndrew Morton * refcount. We do this because invalidate_inode_pages2() needs stronger 323bd4c8ce4SAndrew Morton * invalidation guarantees, and cannot afford to leave pages behind because 324bd4c8ce4SAndrew Morton * shrink_list() has a temp ref on them, or because they're transiently sitting 325bd4c8ce4SAndrew Morton * in the lru_cache_add() pagevecs. 326bd4c8ce4SAndrew Morton */ 327bd4c8ce4SAndrew Morton static int 328bd4c8ce4SAndrew Morton invalidate_complete_page2(struct address_space *mapping, struct page *page) 329bd4c8ce4SAndrew Morton { 330bd4c8ce4SAndrew Morton if (page->mapping != mapping) 331bd4c8ce4SAndrew Morton return 0; 332bd4c8ce4SAndrew Morton 333887ed2f3STrond Myklebust if (PagePrivate(page) && !try_to_release_page(page, GFP_KERNEL)) 334bd4c8ce4SAndrew Morton return 0; 335bd4c8ce4SAndrew Morton 336bd4c8ce4SAndrew Morton write_lock_irq(&mapping->tree_lock); 337bd4c8ce4SAndrew Morton if (PageDirty(page)) 338bd4c8ce4SAndrew Morton goto failed; 339bd4c8ce4SAndrew Morton 340bd4c8ce4SAndrew Morton BUG_ON(PagePrivate(page)); 341bd4c8ce4SAndrew Morton __remove_from_page_cache(page); 342bd4c8ce4SAndrew Morton write_unlock_irq(&mapping->tree_lock); 343bd4c8ce4SAndrew Morton ClearPageUptodate(page); 344bd4c8ce4SAndrew Morton page_cache_release(page); /* pagecache ref */ 345bd4c8ce4SAndrew Morton return 1; 346bd4c8ce4SAndrew Morton failed: 347bd4c8ce4SAndrew Morton write_unlock_irq(&mapping->tree_lock); 348bd4c8ce4SAndrew Morton return 0; 349bd4c8ce4SAndrew Morton } 350bd4c8ce4SAndrew Morton 351e3db7691STrond Myklebust static int do_launder_page(struct address_space *mapping, struct page *page) 352e3db7691STrond Myklebust { 353e3db7691STrond Myklebust if (!PageDirty(page)) 354e3db7691STrond Myklebust return 0; 355e3db7691STrond Myklebust if (page->mapping != mapping || mapping->a_ops->launder_page == NULL) 356e3db7691STrond Myklebust return 0; 357e3db7691STrond Myklebust return mapping->a_ops->launder_page(page); 358e3db7691STrond Myklebust } 359e3db7691STrond Myklebust 3601da177e4SLinus Torvalds /** 3611da177e4SLinus Torvalds * invalidate_inode_pages2_range - remove range of pages from an address_space 36267be2dd1SMartin Waitz * @mapping: the address_space 3631da177e4SLinus Torvalds * @start: the page offset 'from' which to invalidate 3641da177e4SLinus Torvalds * @end: the page offset 'to' which to invalidate (inclusive) 3651da177e4SLinus Torvalds * 3661da177e4SLinus Torvalds * Any pages which are found to be mapped into pagetables are unmapped prior to 3671da177e4SLinus Torvalds * invalidation. 3681da177e4SLinus Torvalds * 3691da177e4SLinus Torvalds * Returns -EIO if any pages could not be invalidated. 3701da177e4SLinus Torvalds */ 3711da177e4SLinus Torvalds int invalidate_inode_pages2_range(struct address_space *mapping, 3721da177e4SLinus Torvalds pgoff_t start, pgoff_t end) 3731da177e4SLinus Torvalds { 3741da177e4SLinus Torvalds struct pagevec pvec; 3751da177e4SLinus Torvalds pgoff_t next; 3761da177e4SLinus Torvalds int i; 3771da177e4SLinus Torvalds int ret = 0; 3781da177e4SLinus Torvalds int did_range_unmap = 0; 3791da177e4SLinus Torvalds int wrapped = 0; 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds pagevec_init(&pvec, 0); 3821da177e4SLinus Torvalds next = start; 3831da177e4SLinus Torvalds while (next <= end && !ret && !wrapped && 3841da177e4SLinus Torvalds pagevec_lookup(&pvec, mapping, next, 3851da177e4SLinus Torvalds min(end - next, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) { 3861da177e4SLinus Torvalds for (i = 0; !ret && i < pagevec_count(&pvec); i++) { 3871da177e4SLinus Torvalds struct page *page = pvec.pages[i]; 3881da177e4SLinus Torvalds pgoff_t page_index; 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds lock_page(page); 3911da177e4SLinus Torvalds if (page->mapping != mapping) { 3921da177e4SLinus Torvalds unlock_page(page); 3931da177e4SLinus Torvalds continue; 3941da177e4SLinus Torvalds } 3951da177e4SLinus Torvalds page_index = page->index; 3961da177e4SLinus Torvalds next = page_index + 1; 3971da177e4SLinus Torvalds if (next == 0) 3981da177e4SLinus Torvalds wrapped = 1; 3991da177e4SLinus Torvalds if (page_index > end) { 4001da177e4SLinus Torvalds unlock_page(page); 4011da177e4SLinus Torvalds break; 4021da177e4SLinus Torvalds } 4031da177e4SLinus Torvalds wait_on_page_writeback(page); 4041da177e4SLinus Torvalds while (page_mapped(page)) { 4051da177e4SLinus Torvalds if (!did_range_unmap) { 4061da177e4SLinus Torvalds /* 4071da177e4SLinus Torvalds * Zap the rest of the file in one hit. 4081da177e4SLinus Torvalds */ 4091da177e4SLinus Torvalds unmap_mapping_range(mapping, 410479ef592SOleg Drokin (loff_t)page_index<<PAGE_CACHE_SHIFT, 411479ef592SOleg Drokin (loff_t)(end - page_index + 1) 4121da177e4SLinus Torvalds << PAGE_CACHE_SHIFT, 4131da177e4SLinus Torvalds 0); 4141da177e4SLinus Torvalds did_range_unmap = 1; 4151da177e4SLinus Torvalds } else { 4161da177e4SLinus Torvalds /* 4171da177e4SLinus Torvalds * Just zap this page 4181da177e4SLinus Torvalds */ 4191da177e4SLinus Torvalds unmap_mapping_range(mapping, 420479ef592SOleg Drokin (loff_t)page_index<<PAGE_CACHE_SHIFT, 4211da177e4SLinus Torvalds PAGE_CACHE_SIZE, 0); 4221da177e4SLinus Torvalds } 4231da177e4SLinus Torvalds } 424e3db7691STrond Myklebust ret = do_launder_page(mapping, page); 425e3db7691STrond Myklebust if (ret == 0 && !invalidate_complete_page2(mapping, page)) 4261da177e4SLinus Torvalds ret = -EIO; 4271da177e4SLinus Torvalds unlock_page(page); 4281da177e4SLinus Torvalds } 4291da177e4SLinus Torvalds pagevec_release(&pvec); 4301da177e4SLinus Torvalds cond_resched(); 4311da177e4SLinus Torvalds } 4328258d4a5SAndrew Morton WARN_ON_ONCE(ret); 4331da177e4SLinus Torvalds return ret; 4341da177e4SLinus Torvalds } 4351da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(invalidate_inode_pages2_range); 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds /** 4381da177e4SLinus Torvalds * invalidate_inode_pages2 - remove all pages from an address_space 43967be2dd1SMartin Waitz * @mapping: the address_space 4401da177e4SLinus Torvalds * 4411da177e4SLinus Torvalds * Any pages which are found to be mapped into pagetables are unmapped prior to 4421da177e4SLinus Torvalds * invalidation. 4431da177e4SLinus Torvalds * 4441da177e4SLinus Torvalds * Returns -EIO if any pages could not be invalidated. 4451da177e4SLinus Torvalds */ 4461da177e4SLinus Torvalds int invalidate_inode_pages2(struct address_space *mapping) 4471da177e4SLinus Torvalds { 4481da177e4SLinus Torvalds return invalidate_inode_pages2_range(mapping, 0, -1); 4491da177e4SLinus Torvalds } 4501da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(invalidate_inode_pages2); 451