UNMAP_MAPPING_RANGE

Section: (9)
Updated: 09 October 2005
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NAME

unmap_mapping_range - unmap the portion of all mmaps

"SYNOPSIS"

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

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 vmtruncate, 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.

in the specified address_space corresponding to the specified page range in the underlying file.

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Time: 00:02:56 GMT, October 09, 2005