From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Tue, 11 Nov 2014 19:01:01 +0000 (-0800)
Subject: f2fs: fix deadlock to grab 0'th data page
X-Git-Tag: omap-for-v3.20/drop-legacy-3517~143^2~36
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=764d2c80401fcc7ee15933d604c6a783d5addc40;p=pandora-kernel.git

f2fs: fix deadlock to grab 0'th data page

The scenario is like this.

One trhead triggers:
  f2fs_write_data_pages
    lock_page
    f2fs_write_data_page
      f2fs_lock_op  <- wait

The other thread triggers:
  f2fs_truncate
    truncate_blocks
      f2fs_lock_op
        truncate_partial_data_page
          lock_page  <- wait for locking the page

This patch resolves this bug by relocating truncate_partial_data_page.
This function is just to truncate user data page and not related to FS
consistency as well.
And, we don't need to call truncate_inline_data. Rather than that,
f2fs_write_data_page will finally update inline_data later.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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