commit 2c84599ca4c2ffd81301f23eabc69c5180ff2f64
author Sheng Yong <shengyong1@huawei.com> Wed Mar 04 10:46:16 2015 +0000
committer Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Wed Mar 25 11:08:40 2015 +0200
tree 0201240875221688874339ad49b6d5ac4e17563e
parent 9401a795c6478953e10226471ba5990db5000e05

UBIFS: do not write master node if need recovery

The commits 781c571 ("UBIFS: intialize LPT earlier") and 0980119 ("UBIFS:
fix-up free space earlier") move some initialization before marking the
master node dirty. But the modification changes the conditions of writing
master.

If unclean umount happens, ubifs may fail when mounting. But trying to
mount it will write new master nodes on the flash. This is useless but
increasing sqnum. So check need_recovery before writing master node, and
don't create new master node if filesystem needs recovery.

The behavour of the bug shows at:
http://lists.infradead.org/pipermail/linux-mtd/2015-February/057712.html

Signed-off-by: Sheng Yong <shengyong1@huawei.com>
Reviewed-by: Ben Gardiner <ben.l.gardiner@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>