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由 Minchan Kim 提交于
If BIO is discarded or cross over end of device, BIO queueing trial doesn't occur. Actually the trace was called just before make_request at first: [PATCH] Block queue IO tracing support (blktrace) as of 2006-03-23 2056a782 And then 2 patches added some checks between them: [PATCH] md: check bio address after mapping through partitions 5ddfe969, [BLOCK] Don't allow empty barriers to be passed down to queues that don't grok them 51fd77bd It breaks original goal. Let's trace it only when it happens. Signed-off-by: NMinchan Kim <minchan.kim@gmail.com> Acked-by: NWu Fengguang <fengguang.wu@intel.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
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