other versions
- wheezy 3.2.78-1
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¶
mappingthe 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¶
March 2016 | Kernel Hackers Manual 3.2. |