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



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

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

ARGUMENTS
       mapping
           the address space containing mmaps to be unmapped.

       holebegin
           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.

       holelen
           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.

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

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                    UNMAP_MAPPING_RANGE(9)