On Sun, May 13, 2012 at 01:50:06PM -0700, Hugh Dickins wrote:

When truncating a file, we unmap pages from userspace first, as that's
usually more efficient than relying, page by page, on the fallback in
truncate_inode_page() - particularly if the file is mapped many times.

Do the same when punching a hole: 3.4 added truncate_pagecache_range()
to do the unmap and trunc, so use it in xfs_flushinval_pages(), instead
of calling truncate_inode_pages_range() directly.

This change looks fine.

Should xfs_tosspages() be using it too?  I don't know: left unchanged.

I'll look at it.  I've been planning to simplify and/or kill the
xfs_fs_subr.c wrappers which tend to confuse the code for a while now,
and deciding what exactly to do should be a fallout from that.

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