From: Mark Fasheh <mark.fasheh@oracle.com>
Date: Wed, 17 Jan 2007 20:53:31 +0000 (-0800)
Subject: ocfs2: teach extend/truncate about sparse files
X-Git-Tag: v2.6.22-rc1~1124^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3a0782d09c07aa3ec767ba6089cd15cfbfbfc508;p=pandora-kernel.git

ocfs2: teach extend/truncate about sparse files

For ocfs2_truncate_file(), we eliminate the "simple" truncate case which no
longer exists since i_size is not tied to i_clusters. In
ocfs2_extend_file(), we skip the allocation / page zeroing code for file
systems which understand sparse files.

The core truncate code is changed to do a bottom up tree traversal. This
gets abstracted out into it's own function. To make things more readable,
most of the special case handling for in-inode extents from
ocfs2_do_truncate() is also removed.

Though write support for sparse files comes in a later patch, we at least
update ocfs2_prepare_inode_for_write() to skip allocation for sparse files.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
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