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| 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¶
struct address_space * mapping
the address space containing mmaps to be unmapped.
loff_t const 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.
loff_t const 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.
int even_cows
1 when truncating a file, unmap even private COWed pages;
but 0 when invalidating pagecache, don't throw away private data.
COPYRIGHT¶
| June 2017 | Kernel Hackers Manual 4.11 |