tree b9709c15f56af0c3d76dd717033a1e08e25ac2ee
parent 470f00e9686f0b338a457568229fe7b7d44b8e6a
author Chao Yu <chao2.yu@samsung.com> 1438079807 +0800
committer Jaegeuk Kim <jaegeuk@kernel.org> 1438787961 -0700

f2fs: invalidate temporary meta page

To avoid meeting garbage data in next free node block at the end of warm
node chain when doing recovery, we will try to zero out that invalid block.

If the device is not support discard, our way for zeroing out block is:
grabbing a temporary zeroed page in meta inode, then, issue write request
with this page.

But, we forget to release that temporary page, so our memory usage will
increase without gaining any hit ratio benefit, so it's better to free it
for saving memory.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>