UNMAP_MAPPING_RANGE
Section: Memory Management in Linux (9)
Updated: February 2011
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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
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void unmap_mapping_range(struct address_space * mapping, loff_t const holebegin, loff_t const holelen, int even_cows);
ARGUMENTS
mapping
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- the address space containing mmaps to be unmapped.
holebegin
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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
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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
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1 when truncating a file, unmap even private COWed pages; but 0 when invalidating pagecache, don't throw away private data.
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