summaryrefslogtreecommitdiffstats
path: root/drivers/mmc/card
diff options
context:
space:
mode:
authorChristoph Hellwig <hch@infradead.org>2011-08-23 14:50:29 +0200
committerJens Axboe <jaxboe@fusionio.com>2011-08-23 14:50:29 +0200
commit65299a3b788bd274bed92f9fa3232082c9f3ea70 (patch)
tree191c0afe31c15ac4c1bab96e0a07fddb097d0de8 /drivers/mmc/card
parent5dc06c5a70b79a323152bec7e55783e705767e63 (diff)
downloadlinux-65299a3b788bd274bed92f9fa3232082c9f3ea70.tar.bz2
block: separate priority boosting from REQ_META
Add a new REQ_PRIO to let requests preempt others in the cfq I/O schedule, and lave REQ_META purely for marking requests as metadata in blktrace. All existing callers of REQ_META except for XFS are updated to also set REQ_PRIO for now. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'drivers/mmc/card')
-rw-r--r--drivers/mmc/card/block.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 1ff5486213fb..4c1a648d00fc 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -926,6 +926,9 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
/*
* Reliable writes are used to implement Forced Unit Access and
* REQ_META accesses, and are supported only on MMCs.
+ *
+ * XXX: this really needs a good explanation of why REQ_META
+ * is treated special.
*/
bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
(req->cmd_flags & REQ_META)) &&