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

6       unmap_mapping_range - unmap the portion of all mmaps in the specified
7       address_space corresponding to the specified page range in the
8       underlying file.
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SYNOPSIS

11       void unmap_mapping_range(struct address_space * mapping,
12                                loff_t const holebegin, loff_t const holelen,
13                                int even_cows);
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ARGUMENTS

16       mapping
17           the address space containing mmaps to be unmapped.
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19       holebegin
20           byte in first page to unmap, relative to the start of the
21           underlying file. This will be rounded down to a PAGE_SIZE boundary.
22           Note that this is different from truncate_pagecache, which must
23           keep the partial page. In contrast, we must get rid of partial
24           pages.
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26       holelen
27           size of prospective hole in bytes. This will be rounded up to a
28           PAGE_SIZE boundary. A holelen of zero truncates to the end of the
29           file.
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31       even_cows
32           1 when truncating a file, unmap even private COWed pages; but 0
33           when invalidating pagecache, don't throw away private data.
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36Kernel Hackers Manual 2.6.       November 2011          UNMAP_MAPPING_RANGE(9)
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