f2fs: add an ioctl to disable GC for specific file
This patch gives a flag to disable GC on given file, which would be useful, when user wants to keep its block map. It also conducts in-place-update for dontmove file. Reviewed-by: NChao Yu <yuchao0@huawei.com> Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>
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