Re: remap_page_range / zeromap_page_range

Jamie Lokier (lkd@tantalophile.demon.co.uk)
Wed, 3 Nov 1999 15:05:59 +0100

Richard Dynes wrote:
> These functions seem to be symmetric, and so I would assume that if
> remap_page_range is called to create the mapping, that when the file
> is closed zeromap_page_range should also be called.

It should call zap_page_range not zeromap_page_range.
zap_page_range removes mappings; zeromap_page_range creates COW zero
maps (cf. MAP_ANONYMOUS, /dev/zero).

However, this is handled for you in munmap(). As long as you have any
mapping of the device, there will be a reference to its inode. The
final call to the inode's release() will happen after the last reference
is removed, at which point all the mappings have been removed anyway.

-- Jamie

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