tree 8fcefc0392041d5406f8bf88300dd53fc23c82f8
parent e63890f38ade9497b5609ddeb7f52df0fe55ea15
author Ryan Ding <ryan.ding@oracle.com> 1458940878 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1458949062 -0700

ocfs2: take ip_alloc_sem in ocfs2_dio_get_block & ocfs2_dio_end_io_write

Take ip_alloc_sem to prevent concurrent access to extent tree, which may
cause the extent tree in an unstable state.

Signed-off-by: Ryan Ding <ryan.ding@oracle.com>
Reviewed-by: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>