Provided by: linux-doc-2.6.15_2.6.15-23.39_all
unmap_mapping_range - unmap the portion of all mmaps
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 vmtruncate, which
must keep the partial page. In contrast, we must get rid of
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
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.