From: Zheng Liu <wenqing.lz@taobao.com>
Date: Mon, 28 Jan 2013 14:21:37 +0000 (-0500)
Subject: ext4: add punching hole support for non-extent-mapped files
X-Git-Tag: v3.9-rc1~64^2~56
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8bad6fc813a3a5300f51369c39d315679fd88c72;p=pandora-kernel.git

ext4: add punching hole support for non-extent-mapped files

This patch add supports for indirect file support punching hole.  It
is almost the same as ext4_ext_punch_hole.  First, we invalidate all
pages between this hole, and then we try to deallocate all blocks of
this hole.

A recursive function is used to handle deallocation of blocks.  In
this function, it iterates over the entries in inode's i_blocks or
indirect blocks, and try to free the block for each one of them.

After applying this patch, xfstest #255 will not pass w/o extent because
indirect-based file doesn't support unwritten extents.

Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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