From: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Date: Mon, 28 Oct 2013 04:17:54 +0000 (+0900)
Subject: f2fs: fix a deadlock during init_acl procedure
X-Git-Tag: v3.13-rc1~113^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2ed2d5b33cb564025b1eb90650d70a0a3592c0e3;p=pandora-kernel.git

f2fs: fix a deadlock during init_acl procedure

The deadlock is found through the following scenario.

sys_mkdir()
 -> f2fs_add_link()
  -> __f2fs_add_link()
   -> init_inode_metadata()
     : lock_page(inode);
    -> f2fs_init_acl()
     -> f2fs_set_acl()
      -> f2fs_setxattr(..., NULL)
       : This NULL page incurs a deadlock at update_inode_page().

So, likewise f2fs_init_security(), this patch adds a parameter to transfer the
locked inode page to f2fs_setxattr().

Found by Linux File System Verification project (linuxtesting.org).

Reported-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
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