tree 4a0b62dfefea207840d752d91a0958cb35f35306
parent d430af2fe9b067378822c00637ea390d673d213c
author Yunlei He <heyunlei@huawei.com> 1495177572 +0800
committer Jaegeuk Kim <jaegeuk@kernel.org> 1499991311 -0700

f2fs: fix a bug caused by NULL extent tree

Thread A:					Thread B:

-f2fs_remount
    -sbi->mount_opt.opt = 0;
						<--- -f2fs_iget
						         -do_read_inode
							     -f2fs_init_extent_tree
							         -F2FS_I(inode)->extent_tree is NULL
        -default_options && parse_options
	    -remount return
						<---  -f2fs_map_blocks
						          -f2fs_lookup_extent_tree
                                                              -f2fs_bug_on(sbi, !et);

The same problem with f2fs_new_inode.

Signed-off-by: Yunlei He <heyunlei@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>