bcache: add backing_request_endio() for bi_end_io
In order to catch I/O error of backing device, a separate bi_end_io call back is required. Then a per backing device counter can record I/O errors number and retire the backing device if the counter reaches a per backing device I/O error limit. This patch adds backing_request_endio() to bcache backing device I/O code path, this is a preparation for further complicated backing device failure handling. So far there is no real code logic change, I make this change a separate patch to make sure it is stable and reliable for further work. Changelog: v2: Fix code comments typo, remove a redundant bch_writeback_add() line added in v4 patch set. v1: indeed this is new added in this patch set. [mlyle: truncated commit subject] Signed-off-by: NColy Li <colyli@suse.de> Reviewed-by: NHannes Reinecke <hare@suse.com> Reviewed-by: NMichael Lyle <mlyle@lyle.org> Cc: Junhui Tang <tang.junhui@zte.com.cn> Cc: Michael Lyle <mlyle@lyle.org> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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