From: Hugh Dickins <hughd@google.com>
Date: Fri, 1 Jun 2012 04:15:28 +0000 (-0400)
Subject: ext4: hole-punch use truncate_pagecache_range
X-Git-Tag: v3.5-rc1~16^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5e44f8c374dc4f8eadf61cd18b2c0d46bc87c1b7;p=pandora-kernel.git

ext4: hole-punch use truncate_pagecache_range

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 ext4_ext_punch_hole(), instead
of calling truncate_inode_pages_range() directly.

Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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