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 (inclusive)
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DESCRIPTION

24       Truncate the page cache, removing the pages that are between specified
25       offsets (and zeroing out partial pages if lstart or lend + 1 is not
26       page aligned).
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28       Truncate takes two passes - the first pass is nonblocking. It will not
29       block on page locks and it will not block on writeback. The second pass
30       will wait. This is to prevent as much IO as possible in the affected
31       region. The first pass will remove most pages, so the search cost of
32       the second pass is low.
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34       We pass down the cache-hot hint to the page freeing code. Even if the
35       mapping is large, it is probably the case that the final pages are the
36       most recently touched, and freeing happens in ascending file offset
37       order.
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39       Note that since ->invalidatepage accepts range to invalidate
40       truncate_inode_pages_range is able to handle cases where lend + 1 is
41       not
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44Kernel Hackers Manual 3.10         June 2019           TRUNCATE_INODE_PAGES(9)
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