1TRUNCATE_INODE_PAGES(9)   Memory Management in Linux   TRUNCATE_INODE_PAGES(9)
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NAME

6       truncate_inode_pages_range - truncate range of pages specified by start
7       & end byte offsets
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SYNOPSIS

10       void truncate_inode_pages_range(struct address_space * mapping,
11                                       loff_t lstart, loff_t lend);
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ARGUMENTS

14       mapping
15           mapping to truncate
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17       lstart
18           offset from which to truncate
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20       lend
21           offset to which to truncate
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DESCRIPTION

24       Truncate the page cache, removing the pages that are between specified
25       offsets (and zeroing out partial page (if lstart is not page aligned)).
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27       Truncate takes two passes - the first pass is nonblocking. It will not
28       block on page locks and it will not block on writeback. The second pass
29       will wait. This is to prevent as much IO as possible in the affected
30       region. The first pass will remove most pages, so the search cost of
31       the second pass is low.
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33       When looking at page->index outside the page lock we need to be careful
34       to copy it into a local to avoid races (it could change at any time).
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36       We pass down the cache-hot hint to the page freeing code. Even if the
37       mapping is large, it is probably the case that the final pages are the
38       most recently touched, and freeing happens in ascending file offset
39       order.
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42Kernel Hackers Manual 2.6.       November 2011         TRUNCATE_INODE_PAGES(9)
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