f2fs: use block layer helper for show_bio_op macro
Adjust the f2fs tracing code to use newly introduced block layer function blk_op_str() which converts the REQ_OP_XXX into the string XXX. Reviewed-by: NChao Yu <yuchao0@huawei.com> Signed-off-by: NChaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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