The blkdev_issue_flush() will check if the write cache is enabled
before submitting the flush. This will add a code to fail fast if
its not.
Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
---
v2: This patch will now _not_ replace the below patch and this patch
should be applied on top of it.
[PATCH] btrfs: delete unused member nobarriers
That's because, Q write cache flag is not static, so we can't save
its state into nobarries.
- commit log is updated.
v3: no change
v4: no change
fs/btrfs/disk-io.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index b6d047250ce2..bb5816c7f5c4 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3517,6 +3517,11 @@ static void btrfs_dev_issue_flush(struct work_struct *work)
*/
static int write_dev_flush(struct btrfs_device *device, int wait)
{
+ struct request_queue *q = bdev_get_queue(device->bdev);
+
+ if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags))
+ return 0;
+
if (wait) {
int ret;
--
2.10.0
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