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unmap_mapping_range(9) - phpMan

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

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

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

           the address space containing mmaps to be unmapped.

           byte in first page to unmap, relative to the start of the underlying file. This will
           be rounded down to a PAGE_SIZE boundary. Note that this is different from
           truncate_pagecache, which must keep the partial page. In contrast, we must get rid of
           partial pages.

           size of prospective hole in bytes. This will be rounded up to a PAGE_SIZE boundary. A
           holelen of zero truncates to the end of the file.

           1 when truncating a file, unmap even private COWed pages; but 0 when invalidating
           pagecache, don't throw away private data.

Kernel Hackers Manual 4.8.                 January 2017                    UNMAP_MAPPING_RANGE(9)

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