Yunlei He 746e240392 f2fs: add a case of no need to read a page in write begin
If the range we write cover the whole valid data in the last page,
we do not need to read it.

Signed-off-by: Yunlei He <heyunlei@huawei.com>
[Jaegeuk Kim: nullify the remaining area (fix: xfstests/f2fs/001)]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
2017-01-29 12:46:01 +09:00
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