From: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Date: Mon, 3 Feb 2014 08:24:51 +0000 (+0900)
Subject: f2fs: fix the potential mismatch between dir's i_size and i_blocks
X-Git-Tag: v3.15-rc1~62^2~57
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=924a2ddbd0c2829ebca9ac899522cbb16a9b6d8c;p=pandora-kernel.git

f2fs: fix the potential mismatch between dir's i_size and i_blocks

This is the erroneous scenario.

                             i_size    on-disk i_size    i_blocks
__f2fs_add_link()             4096           4096           2
 get_new_data_page            8192           4096           3
 -ENOSPC = init_inode_metadata
 checkpoint                     -            4096           3
 POR and reboot

__f2fs_add_link()             4096           4096           3
 page = get_new_data_page (page->index = 1 by NEW_ADDR)
 add a dentry to the page successfully

f2fs_rmdir()
 f2fs_empty_dir()             4096           4096           3
 f2fs_unlink() goes, since there is no valid dentry due to i_size = 4096.
 But, still there is one dentry in page->index = 1.

So this patch moves the code to write dir->i_size into on-disk i_size in order
to sync dir's i_size, on-disk i_size, and its i_blocks.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
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