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Subject[PATCH 3.16 099/133] bcache: do not subtract sectors_to_gc for bypassed IO
3.16.51-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Tang Junhui <tang.junhui@zte.com.cn>

commit 69daf03adef5f7bc13e0ac86b4b8007df1767aab upstream.

Since bypassed IOs use no bucket, so do not subtract sectors_to_gc to
trigger gc thread.

Signed-off-by: tang.junhui <tang.junhui@zte.com.cn>
Acked-by: Coly Li <colyli@suse.de>
Reviewed-by: Eric Wheeler <bcache@linux.ewheeler.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/md/bcache/request.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -193,14 +193,14 @@ static void bch_data_insert_start(struct
struct data_insert_op *op = container_of(cl, struct data_insert_op, cl);
struct bio *bio = op->bio, *n;

+ if (op->bypass)
+ return bch_data_invalidate(cl);
+
if (atomic_sub_return(bio_sectors(bio), &op->c->sectors_to_gc) < 0) {
set_gc_sectors(op->c);
wake_up_gc(op->c);
}

- if (op->bypass)
- return bch_data_invalidate(cl);
-
/*
* Journal writes are marked REQ_FLUSH; if the original write was a
* flush, it'll wait on the journal write.
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