f2fs: use rb-tree to track pending discard commands
Introduce rb-tree based discard cache infrastructure to speed up lookup and merge operation of discard entry. Signed-off-by: Chao Yu <yuchao0@huawei.com> [Jaegeuk Kim: initialize dc to avoid build warning] Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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d40d30c5