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btrfs: check if the device is flush capable 

The block layer call chain from submit_bio will check if the write cache
is enabled for the given queue before submitting the flush. This will
add a code to fail fast if its not.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ updated changelog to reflect current code stat, blkdev_issue_flush is
  not used yet ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2017-04-06 11:22:53 +08:00 committed by David Sterba
parent 13e88e1560
commit c2a9c7ab47
1 changed files with 4 additions and 0 deletions
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4
fs/btrfs/disk-io.c
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@ -3518,9 +3518,13 @@ static void btrfs_end_empty_barrier(struct bio *bio)
*/
static int write_dev_flush(struct btrfs_device *device, int wait)
{
struct request_queue *q = bdev_get_queue(device->bdev);
struct bio *bio;
int ret = 0;
if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags))
return 0;
if (wait) {
bio = device->flush_bio;
if (!bio)