| unmap_mapping_range(9) - phpMan
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)
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