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Commit c2a9c7ab authored by Anand Jain's avatar Anand Jain Committed by David Sterba
Browse files

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: default avatarAnand Jain <anand.jain@oracle.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
[ updated changelog to reflect current code stat, blkdev_issue_flush is
  not used yet ]
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 13e88e15

fs/btrfs/disk-io.c

+4 −0
Original line number Diff line number Diff line
@@ -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)