Re: [PATCH 1/1] Enable fully functional truncate for hugetlbfs

["Ken Chen" <kenchen@google.com>]

On 2/12/07, Dave McCracken <dave.mccracken@oracle.com> wrote:
> This patch enables the full functionality of truncate for hugetlbfs
> files.  Truncate was originally limited to reducing the file size
> because page faults were not supported for hugetlbfs.  Now that page
> faults have been implemented it is now possible to fully support
> truncate.

ye!

> --- 2.6.20/./fs/hugetlbfs/inode.c       2007-02-04 12:44:54.000000000 -0600
> +++ 2.6.20-htrunc/./fs/hugetlbfs/inode.c        2007-02-05 13:02:00.000000000 -0600
> +       if (hugetlb_reserve_pages(inode, inode->i_size >> HPAGE_SHIFT,
> +                                 offset >> HPAGE_SHIFT))
> +               goto out_mem;
> +       i_size_write(inode, offset);

hugetlb_reserve_pages() is used to reserve pages for shared mapping
and is used only for the size of mapping at the time of mmap().  We
shouldn't call this function when expanding hugetlb file.

- Ken
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