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mm/truncate.c
19.5 KB
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/* * mm/truncate.c - code for taking down pages from address_spaces * * Copyright (C) 2002, Linus Torvalds * |
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* 10Sep2002 Andrew Morton |
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* Initial version. */ #include <linux/kernel.h> |
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#include <linux/backing-dev.h> |
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#include <linux/gfp.h> |
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#include <linux/mm.h> |
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#include <linux/swap.h> |
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#include <linux/export.h> |
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#include <linux/pagemap.h> |
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#include <linux/highmem.h> |
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#include <linux/pagevec.h> |
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#include <linux/task_io_accounting_ops.h> |
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#include <linux/buffer_head.h> /* grr. try_to_release_page, |
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do_invalidatepage */ |
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#include <linux/cleancache.h> |
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#include "internal.h" |
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|
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/** |
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* do_invalidatepage - invalidate part or all of a page |
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* @page: the page which is affected |
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* @offset: start of the range to invalidate * @length: length of the range to invalidate |
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* * do_invalidatepage() is called when all or part of the page has become * invalidated by a truncate operation. * * do_invalidatepage() does not have to release all buffers, but it must * ensure that no dirty buffer is left outside @offset and that no I/O * is underway against any of the blocks which are outside the truncation * point. Because the caller is about to free (and possibly reuse) those * blocks on-disk. */ |
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void do_invalidatepage(struct page *page, unsigned int offset, unsigned int length) |
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{ |
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void (*invalidatepage)(struct page *, unsigned int, unsigned int); |
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invalidatepage = page->mapping->a_ops->invalidatepage; |
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#ifdef CONFIG_BLOCK |
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if (!invalidatepage) invalidatepage = block_invalidatepage; |
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#endif |
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if (invalidatepage) |
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(*invalidatepage)(page, offset, length); |
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} |
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/* * This cancels just the dirty bit on the kernel page itself, it * does NOT actually remove dirty bits on any mmap's that may be * around. It also leaves the page tagged dirty, so any sync * activity will still find it on the dirty lists, and in particular, * clear_page_dirty_for_io() will still look at the dirty bits in * the VM. * * Doing this should *normally* only ever be done when a page * is truncated, and is not actually mapped anywhere at all. However, * fs/buffer.c does this when it notices that somebody has cleaned * out all the buffers on a page without actually doing it through * the VM. Can you say "ext3 is horribly ugly"? Tought you could. */ |
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void cancel_dirty_page(struct page *page, unsigned int account_size) { |
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if (TestClearPageDirty(page)) { struct address_space *mapping = page->mapping; if (mapping && mapping_cap_account_dirty(mapping)) { dec_zone_page_state(page, NR_FILE_DIRTY); |
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dec_bdi_stat(mapping->backing_dev_info, BDI_RECLAIMABLE); |
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if (account_size) task_io_account_cancelled_write(account_size); } |
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} |
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} |
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EXPORT_SYMBOL(cancel_dirty_page); |
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|
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/* * If truncate cannot remove the fs-private metadata from the page, the page |
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* becomes orphaned. It will be left on the LRU and may even be mapped into |
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* user pagetables if we're racing with filemap_fault(). |
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* * We need to bale out if page->mapping is no longer equal to the original * mapping. This happens a) when the VM reclaimed the page while we waited on |
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* its lock, b) when a concurrent invalidate_mapping_pages got there first and |
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* c) when tmpfs swizzles a page between a tmpfs inode and swapper_space. */ |
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static int |
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truncate_complete_page(struct address_space *mapping, struct page *page) { if (page->mapping != mapping) |
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return -EIO; |
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|
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if (page_has_private(page)) |
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do_invalidatepage(page, 0, PAGE_CACHE_SIZE); |
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|
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cancel_dirty_page(page, PAGE_CACHE_SIZE); |
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ClearPageMappedToDisk(page); |
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delete_from_page_cache(page); |
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return 0; |
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} /* |
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* This is for invalidate_mapping_pages(). That function can be called at |
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* any time, and is not supposed to throw away dirty pages. But pages can |
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* be marked dirty at any time too, so use remove_mapping which safely * discards clean, unused pages. |
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* * Returns non-zero if the page was successfully invalidated. */ static int invalidate_complete_page(struct address_space *mapping, struct page *page) { |
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int ret; |
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if (page->mapping != mapping) return 0; |
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if (page_has_private(page) && !try_to_release_page(page, 0)) |
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return 0; |
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ret = remove_mapping(mapping, page); |
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return ret; |
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} |
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int truncate_inode_page(struct address_space *mapping, struct page *page) { if (page_mapped(page)) { unmap_mapping_range(mapping, (loff_t)page->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE, 0); } return truncate_complete_page(mapping, page); } |
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/* |
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* Used to get rid of pages on hardware memory corruption. */ int generic_error_remove_page(struct address_space *mapping, struct page *page) { if (!mapping) return -EINVAL; /* * Only punch for normal data pages for now. * Handling other types like directories would need more auditing. */ if (!S_ISREG(mapping->host->i_mode)) return -EIO; return truncate_inode_page(mapping, page); } EXPORT_SYMBOL(generic_error_remove_page); /* |
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* Safely invalidate one page from its pagecache mapping. * It only drops clean, unused pages. The page must be locked. * * Returns 1 if the page is successfully invalidated, otherwise 0. */ int invalidate_inode_page(struct page *page) { struct address_space *mapping = page_mapping(page); if (!mapping) return 0; if (PageDirty(page) || PageWriteback(page)) return 0; if (page_mapped(page)) return 0; return invalidate_complete_page(mapping, page); } |
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/** |
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* truncate_inode_pages_range - truncate range of pages specified by start & end byte offsets |
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* @mapping: mapping to truncate * @lstart: offset from which to truncate |
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* @lend: offset to which to truncate (inclusive) |
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* |
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* Truncate the page cache, removing the pages that are between |
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* specified offsets (and zeroing out partial pages * if lstart or lend + 1 is not page aligned). |
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* * Truncate takes two passes - the first pass is nonblocking. It will not * block on page locks and it will not block on writeback. The second pass * will wait. This is to prevent as much IO as possible in the affected region. * The first pass will remove most pages, so the search cost of the second pass * is low. * |
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* We pass down the cache-hot hint to the page freeing code. Even if the * mapping is large, it is probably the case that the final pages are the most * recently touched, and freeing happens in ascending file offset order. |
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* * Note that since ->invalidatepage() accepts range to invalidate * truncate_inode_pages_range is able to handle cases where lend + 1 is not * page aligned properly. |
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*/ |
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void truncate_inode_pages_range(struct address_space *mapping, loff_t lstart, loff_t lend) |
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{ |
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pgoff_t start; /* inclusive */ pgoff_t end; /* exclusive */ unsigned int partial_start; /* inclusive */ unsigned int partial_end; /* exclusive */ struct pagevec pvec; pgoff_t index; int i; |
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|
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cleancache_invalidate_inode(mapping); |
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if (mapping->nrpages == 0) return; |
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/* Offsets within partial pages */ partial_start = lstart & (PAGE_CACHE_SIZE - 1); partial_end = (lend + 1) & (PAGE_CACHE_SIZE - 1); /* * 'start' and 'end' always covers the range of pages to be fully * truncated. Partial pages are covered with 'partial_start' at the * start of the range and 'partial_end' at the end of the range. * Note that 'end' is exclusive while 'lend' is inclusive. */ start = (lstart + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; if (lend == -1) /* * lend == -1 indicates end-of-file so we have to set 'end' * to the highest possible pgoff_t and since the type is * unsigned we're using -1. */ end = -1; else end = (lend + 1) >> PAGE_CACHE_SHIFT; |
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|
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pagevec_init(&pvec, 0); |
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index = start; |
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while (index < end && pagevec_lookup(&pvec, mapping, index, min(end - index, (pgoff_t)PAGEVEC_SIZE))) { |
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mem_cgroup_uncharge_start(); |
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for (i = 0; i < pagevec_count(&pvec); i++) { struct page *page = pvec.pages[i]; |
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|
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/* We rely upon deletion not changing page->index */ index = page->index; |
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if (index >= end) |
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break; |
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|
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if (!trylock_page(page)) |
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continue; |
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WARN_ON(page->index != index); |
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if (PageWriteback(page)) { unlock_page(page); continue; } |
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truncate_inode_page(mapping, page); |
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unlock_page(page); } pagevec_release(&pvec); |
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mem_cgroup_uncharge_end(); |
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cond_resched(); |
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index++; |
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} |
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if (partial_start) { |
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struct page *page = find_lock_page(mapping, start - 1); if (page) { |
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unsigned int top = PAGE_CACHE_SIZE; if (start > end) { /* Truncation within a single page */ top = partial_end; partial_end = 0; } |
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wait_on_page_writeback(page); |
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zero_user_segment(page, partial_start, top); cleancache_invalidate_page(mapping, page); if (page_has_private(page)) do_invalidatepage(page, partial_start, top - partial_start); |
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unlock_page(page); page_cache_release(page); } } |
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if (partial_end) { struct page *page = find_lock_page(mapping, end); if (page) { wait_on_page_writeback(page); zero_user_segment(page, 0, partial_end); cleancache_invalidate_page(mapping, page); if (page_has_private(page)) do_invalidatepage(page, 0, partial_end); unlock_page(page); page_cache_release(page); } } /* * If the truncation happened within a single page no pages * will be released, just zeroed, so we can bail out now. */ if (start >= end) return; |
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|
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index = start; |
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for ( ; ; ) { cond_resched(); |
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if (!pagevec_lookup(&pvec, mapping, index, |
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min(end - index, (pgoff_t)PAGEVEC_SIZE))) { |
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if (index == start) |
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break; |
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index = start; |
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continue; } |
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if (index == start && pvec.pages[0]->index >= end) { |
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pagevec_release(&pvec); break; } |
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mem_cgroup_uncharge_start(); |
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for (i = 0; i < pagevec_count(&pvec); i++) { struct page *page = pvec.pages[i]; |
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/* We rely upon deletion not changing page->index */ index = page->index; |
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if (index >= end) |
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break; |
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|
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lock_page(page); |
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WARN_ON(page->index != index); |
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wait_on_page_writeback(page); |
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truncate_inode_page(mapping, page); |
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unlock_page(page); } pagevec_release(&pvec); |
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mem_cgroup_uncharge_end(); |
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index++; |
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} |
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cleancache_invalidate_inode(mapping); |
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} |
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EXPORT_SYMBOL(truncate_inode_pages_range); |
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|
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/** * truncate_inode_pages - truncate *all* the pages from an offset * @mapping: mapping to truncate * @lstart: offset from which to truncate * |
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* Called under (and serialised by) inode->i_mutex. |
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* * Note: When this function returns, there can be a page in the process of * deletion (inside __delete_from_page_cache()) in the specified range. Thus * mapping->nrpages can be non-zero when this function returns even after * truncation of the whole mapping. |
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*/ void truncate_inode_pages(struct address_space *mapping, loff_t lstart) { truncate_inode_pages_range(mapping, lstart, (loff_t)-1); } |
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EXPORT_SYMBOL(truncate_inode_pages); |
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/** * invalidate_mapping_pages - Invalidate all the unlocked pages of one inode * @mapping: the address_space which holds the pages to invalidate * @start: the offset 'from' which to invalidate * @end: the offset 'to' which to invalidate (inclusive) * * This function only removes the unlocked pages, if you want to * remove all the pages of one inode, you must call truncate_inode_pages. * * invalidate_mapping_pages() will not block on IO activity. It will not * invalidate pages which are dirty, locked, under writeback or mapped into * pagetables. */ unsigned long invalidate_mapping_pages(struct address_space *mapping, |
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pgoff_t start, pgoff_t end) |
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{ struct pagevec pvec; |
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pgoff_t index = start; |
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unsigned long ret; unsigned long count = 0; |
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int i; |
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/* * Note: this function may get called on a shmem/tmpfs mapping: * pagevec_lookup() might then return 0 prematurely (because it * got a gangful of swap entries); but it's hardly worth worrying * about - it can rarely have anything to free from such a mapping * (most pages are dirty), and already skips over any difficulties. */ |
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pagevec_init(&pvec, 0); |
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while (index <= end && pagevec_lookup(&pvec, mapping, index, min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) { |
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mem_cgroup_uncharge_start(); |
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for (i = 0; i < pagevec_count(&pvec); i++) { struct page *page = pvec.pages[i]; |
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|
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/* We rely upon deletion not changing page->index */ |
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index = page->index; |
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if (index > end) break; |
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|
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if (!trylock_page(page)) continue; WARN_ON(page->index != index); |
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ret = invalidate_inode_page(page); |
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unlock_page(page); |
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/* * Invalidation is a hint that the page is no longer * of interest and try to speed up its reclaim. */ if (!ret) deactivate_page(page); count += ret; |
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} pagevec_release(&pvec); |
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mem_cgroup_uncharge_end(); |
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cond_resched(); |
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index++; |
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} |
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return count; |
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} |
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EXPORT_SYMBOL(invalidate_mapping_pages); |
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|
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/* * This is like invalidate_complete_page(), except it ignores the page's * refcount. We do this because invalidate_inode_pages2() needs stronger * invalidation guarantees, and cannot afford to leave pages behind because |
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* shrink_page_list() has a temp ref on them, or because they're transiently * sitting in the lru_cache_add() pagevecs. |
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*/ static int invalidate_complete_page2(struct address_space *mapping, struct page *page) { if (page->mapping != mapping) return 0; |
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if (page_has_private(page) && !try_to_release_page(page, GFP_KERNEL)) |
bd4c8ce41 [PATCH] invalidat... |
423 |
return 0; |
19fd62312 mm: spinlock tree... |
424 |
spin_lock_irq(&mapping->tree_lock); |
bd4c8ce41 [PATCH] invalidat... |
425 426 |
if (PageDirty(page)) goto failed; |
266cf658e FS-Cache: Recruit... |
427 |
BUG_ON(page_has_private(page)); |
e64a782fe mm: change __remo... |
428 |
__delete_from_page_cache(page); |
19fd62312 mm: spinlock tree... |
429 |
spin_unlock_irq(&mapping->tree_lock); |
e767e0561 memcg: fix deadlo... |
430 |
mem_cgroup_uncharge_cache_page(page); |
6072d13c4 Call the filesyst... |
431 432 433 |
if (mapping->a_ops->freepage) mapping->a_ops->freepage(page); |
bd4c8ce41 [PATCH] invalidat... |
434 435 436 |
page_cache_release(page); /* pagecache ref */ return 1; failed: |
19fd62312 mm: spinlock tree... |
437 |
spin_unlock_irq(&mapping->tree_lock); |
bd4c8ce41 [PATCH] invalidat... |
438 439 |
return 0; } |
e3db7691e [PATCH] NFS: Fix ... |
440 441 442 443 444 445 446 447 |
static int do_launder_page(struct address_space *mapping, struct page *page) { if (!PageDirty(page)) return 0; if (page->mapping != mapping || mapping->a_ops->launder_page == NULL) return 0; return mapping->a_ops->launder_page(page); } |
1da177e4c Linux-2.6.12-rc2 |
448 449 |
/** * invalidate_inode_pages2_range - remove range of pages from an address_space |
67be2dd1b [PATCH] DocBook: ... |
450 |
* @mapping: the address_space |
1da177e4c Linux-2.6.12-rc2 |
451 452 453 454 455 456 |
* @start: the page offset 'from' which to invalidate * @end: the page offset 'to' which to invalidate (inclusive) * * Any pages which are found to be mapped into pagetables are unmapped prior to * invalidation. * |
6ccfa806a VFS: fix dio writ... |
457 |
* Returns -EBUSY if any pages could not be invalidated. |
1da177e4c Linux-2.6.12-rc2 |
458 459 460 461 462 |
*/ int invalidate_inode_pages2_range(struct address_space *mapping, pgoff_t start, pgoff_t end) { struct pagevec pvec; |
b85e0effd mm: consistent tr... |
463 |
pgoff_t index; |
1da177e4c Linux-2.6.12-rc2 |
464 465 |
int i; int ret = 0; |
0dd1334fa fix invalidate_in... |
466 |
int ret2 = 0; |
1da177e4c Linux-2.6.12-rc2 |
467 |
int did_range_unmap = 0; |
1da177e4c Linux-2.6.12-rc2 |
468 |
|
3167760f8 mm: cleancache: s... |
469 |
cleancache_invalidate_inode(mapping); |
1da177e4c Linux-2.6.12-rc2 |
470 |
pagevec_init(&pvec, 0); |
b85e0effd mm: consistent tr... |
471 472 473 |
index = start; while (index <= end && pagevec_lookup(&pvec, mapping, index, min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) { |
569b846df memcg: coalesce u... |
474 |
mem_cgroup_uncharge_start(); |
7b965e088 [PATCH] VM: inval... |
475 |
for (i = 0; i < pagevec_count(&pvec); i++) { |
1da177e4c Linux-2.6.12-rc2 |
476 |
struct page *page = pvec.pages[i]; |
b85e0effd mm: consistent tr... |
477 478 479 480 481 |
/* We rely upon deletion not changing page->index */ index = page->index; if (index > end) break; |
1da177e4c Linux-2.6.12-rc2 |
482 483 |
lock_page(page); |
b85e0effd mm: consistent tr... |
484 |
WARN_ON(page->index != index); |
1da177e4c Linux-2.6.12-rc2 |
485 486 487 488 |
if (page->mapping != mapping) { unlock_page(page); continue; } |
1da177e4c Linux-2.6.12-rc2 |
489 |
wait_on_page_writeback(page); |
d00806b18 mm: fix fault vs ... |
490 |
if (page_mapped(page)) { |
1da177e4c Linux-2.6.12-rc2 |
491 492 493 494 495 |
if (!did_range_unmap) { /* * Zap the rest of the file in one hit. */ unmap_mapping_range(mapping, |
b85e0effd mm: consistent tr... |
496 497 498 |
(loff_t)index << PAGE_CACHE_SHIFT, (loff_t)(1 + end - index) << PAGE_CACHE_SHIFT, |
1da177e4c Linux-2.6.12-rc2 |
499 500 501 502 503 504 505 |
0); did_range_unmap = 1; } else { /* * Just zap this page */ unmap_mapping_range(mapping, |
b85e0effd mm: consistent tr... |
506 507 |
(loff_t)index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE, 0); |
1da177e4c Linux-2.6.12-rc2 |
508 509 |
} } |
d00806b18 mm: fix fault vs ... |
510 |
BUG_ON(page_mapped(page)); |
0dd1334fa fix invalidate_in... |
511 512 513 |
ret2 = do_launder_page(mapping, page); if (ret2 == 0) { if (!invalidate_complete_page2(mapping, page)) |
6ccfa806a VFS: fix dio writ... |
514 |
ret2 = -EBUSY; |
0dd1334fa fix invalidate_in... |
515 516 517 |
} if (ret2 < 0) ret = ret2; |
1da177e4c Linux-2.6.12-rc2 |
518 519 520 |
unlock_page(page); } pagevec_release(&pvec); |
569b846df memcg: coalesce u... |
521 |
mem_cgroup_uncharge_end(); |
1da177e4c Linux-2.6.12-rc2 |
522 |
cond_resched(); |
b85e0effd mm: consistent tr... |
523 |
index++; |
1da177e4c Linux-2.6.12-rc2 |
524 |
} |
3167760f8 mm: cleancache: s... |
525 |
cleancache_invalidate_inode(mapping); |
1da177e4c Linux-2.6.12-rc2 |
526 527 528 529 530 531 |
return ret; } EXPORT_SYMBOL_GPL(invalidate_inode_pages2_range); /** * invalidate_inode_pages2 - remove all pages from an address_space |
67be2dd1b [PATCH] DocBook: ... |
532 |
* @mapping: the address_space |
1da177e4c Linux-2.6.12-rc2 |
533 534 535 536 |
* * Any pages which are found to be mapped into pagetables are unmapped prior to * invalidation. * |
e9de25dda mm: fix comments ... |
537 |
* Returns -EBUSY if any pages could not be invalidated. |
1da177e4c Linux-2.6.12-rc2 |
538 539 540 541 542 543 |
*/ int invalidate_inode_pages2(struct address_space *mapping) { return invalidate_inode_pages2_range(mapping, 0, -1); } EXPORT_SYMBOL_GPL(invalidate_inode_pages2); |
25d9e2d15 truncate: new hel... |
544 545 546 547 |
/** * truncate_pagecache - unmap and remove pagecache that has been truncated * @inode: inode |
8a549bea5 mm: tidy vmtrunca... |
548 |
* @newsize: new file size |
25d9e2d15 truncate: new hel... |
549 550 551 552 553 554 555 556 557 558 559 |
* * inode's new i_size must already be written before truncate_pagecache * is called. * * This function should typically be called before the filesystem * releases resources associated with the freed range (eg. deallocates * blocks). This way, pagecache will always stay logically coherent * with on-disk format, and the filesystem would not have to deal with * situations such as writepage being called for a page that has already * had its underlying blocks deallocated. */ |
7caef2676 truncate: drop 'o... |
560 |
void truncate_pagecache(struct inode *inode, loff_t newsize) |
25d9e2d15 truncate: new hel... |
561 |
{ |
cedabed49 vfs: Fix vmtrunca... |
562 |
struct address_space *mapping = inode->i_mapping; |
8a549bea5 mm: tidy vmtrunca... |
563 |
loff_t holebegin = round_up(newsize, PAGE_SIZE); |
cedabed49 vfs: Fix vmtrunca... |
564 565 566 567 568 569 570 571 572 573 |
/* * unmap_mapping_range is called twice, first simply for * efficiency so that truncate_inode_pages does fewer * single-page unmaps. However after this first call, and * before truncate_inode_pages finishes, it is possible for * private pages to be COWed, which remain after * truncate_inode_pages finishes, hence the second * unmap_mapping_range call must be made for correctness. */ |
8a549bea5 mm: tidy vmtrunca... |
574 575 576 |
unmap_mapping_range(mapping, holebegin, 0, 1); truncate_inode_pages(mapping, newsize); unmap_mapping_range(mapping, holebegin, 0, 1); |
25d9e2d15 truncate: new hel... |
577 578 579 580 |
} EXPORT_SYMBOL(truncate_pagecache); /** |
2c27c65ed check ATTR_SIZE c... |
581 582 583 584 |
* truncate_setsize - update inode and pagecache for a new file size * @inode: inode * @newsize: new file size * |
382e27daa mm: fix truncate_... |
585 586 587 |
* truncate_setsize updates i_size and performs pagecache truncation (if * necessary) to @newsize. It will be typically be called from the filesystem's * setattr function when ATTR_SIZE is passed in. |
2c27c65ed check ATTR_SIZE c... |
588 |
* |
382e27daa mm: fix truncate_... |
589 590 |
* Must be called with inode_mutex held and before all filesystem specific * block truncation has been performed. |
2c27c65ed check ATTR_SIZE c... |
591 592 593 |
*/ void truncate_setsize(struct inode *inode, loff_t newsize) { |
2c27c65ed check ATTR_SIZE c... |
594 |
i_size_write(inode, newsize); |
7caef2676 truncate: drop 'o... |
595 |
truncate_pagecache(inode, newsize); |
2c27c65ed check ATTR_SIZE c... |
596 597 598 599 |
} EXPORT_SYMBOL(truncate_setsize); /** |
623e3db9f mm for fs: add tr... |
600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 |
* truncate_pagecache_range - unmap and remove pagecache that is hole-punched * @inode: inode * @lstart: offset of beginning of hole * @lend: offset of last byte of hole * * This function should typically be called before the filesystem * releases resources associated with the freed range (eg. deallocates * blocks). This way, pagecache will always stay logically coherent * with on-disk format, and the filesystem would not have to deal with * situations such as writepage being called for a page that has already * had its underlying blocks deallocated. */ void truncate_pagecache_range(struct inode *inode, loff_t lstart, loff_t lend) { struct address_space *mapping = inode->i_mapping; loff_t unmap_start = round_up(lstart, PAGE_SIZE); loff_t unmap_end = round_down(1 + lend, PAGE_SIZE) - 1; /* * This rounding is currently just for example: unmap_mapping_range * expands its hole outwards, whereas we want it to contract the hole * inwards. However, existing callers of truncate_pagecache_range are |
5a7203947 mm: teach truncat... |
621 622 |
* doing their own page rounding first. Note that unmap_mapping_range * allows holelen 0 for all, and we allow lend -1 for end of file. |
623e3db9f mm for fs: add tr... |
623 624 625 626 627 628 629 630 631 632 633 634 635 |
*/ /* * Unlike in truncate_pagecache, unmap_mapping_range is called only * once (before truncating pagecache), and without "even_cows" flag: * hole-punching should not remove private COWed pages from the hole. */ if ((u64)unmap_end > (u64)unmap_start) unmap_mapping_range(mapping, unmap_start, 1 + unmap_end - unmap_start, 0); truncate_inode_pages_range(mapping, lstart, lend); } EXPORT_SYMBOL(truncate_pagecache_range); |