f2fs: remove the orphan block page array

As the orphan_blocks may be max to 504, so it is not security
and rigorous to store such a large array in the kernel stack
as Dan Carpenter said.
In fact, grab_meta_page has locked the page in the page cache,
and we can use find_get_page() to fetch the page safely in the
downstream, so we can remove the page array directly.

Reported-by: Dan Carpenter <[email protected]>
Signed-off-by: Gu Zheng <[email protected]>
Signed-off-by: Jaegeuk Kim <[email protected]>
1 file changed