From: Jan Kara <jack@suse.cz>
Date: Tue, 4 Jun 2013 18:30:00 +0000 (-0400)
Subject: ext4: remove wait for unwritten extent conversion from ext4_truncate()
X-Git-Tag: omap-for-v3.11/fixes-for-merge-window~83^2~39
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a115f749c1;p=pandora-kernel.git

ext4: remove wait for unwritten extent conversion from ext4_truncate()

Since PageWriteback bit is now cleared after extents are converted
from unwritten to written ones, we have full exclusion of writeback
path from truncate (truncate_inode_pages() waits for PageWriteback
bits to get cleared on all invalidated pages).  Exclusion from DIO
path is achieved by inode_dio_wait() call in ext4_setattr().  So
there's no need to wait for extent convertion in ext4_truncate()
anymore.

Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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