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authorRoman Peniaev <r.peniaev@gmail.com>2014-03-08 21:59:14 +0900
committerBrian Norris <computersforpeace@gmail.com>2014-04-15 23:25:37 -0700
commit566c0d6a74169dc5cc9f353ff4a8d579d96a85ff (patch)
tree11e9a6727d03c958f40843454be9c810e5f70f7b /drivers/mtd/mtd_blkdevs.c
parent47570bb1f533b2a48e5222db8545b7842c229331 (diff)
mtd: mtd_blkdevs: handle REQ_FLUSH request and do explicit flush of writeback buffer
mtd_blkdevs is device with volatile cache (writeback buffer), so it should support REQ_FLUSH to do explicit flush. Without this patch 'sync' does not guarantee that writeback buffer will be flushed on disk in case of power off, e.g.: $ cp some_file /mnt $ sync ### POWER OFF In case of this sequence writeback buffer will not be flushed on disk. This patch fixes this behaviour and explicitly reports to block layer that flush requests are being supported. Signed-off-by: Roman Peniaev <r.peniaev@gmail.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: linux-mtd@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers/mtd/mtd_blkdevs.c')
-rw-r--r--drivers/mtd/mtd_blkdevs.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 0b2ccb68c0d0..d2f0da91a5bd 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -88,6 +88,9 @@ static int do_blktrans_request(struct mtd_blktrans_ops *tr,
if (req->cmd_type != REQ_TYPE_FS)
return -EIO;
+ if (req->cmd_flags & REQ_FLUSH)
+ return tr->flush(dev);
+
if (blk_rq_pos(req) + blk_rq_cur_sectors(req) >
get_capacity(req->rq_disk))
return -EIO;
@@ -408,6 +411,9 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
if (!new->rq)
goto error3;
+ if (tr->flush)
+ blk_queue_flush(new->rq, REQ_FLUSH);
+
new->rq->queuedata = new;
blk_queue_logical_block_size(new->rq, tr->blksize);