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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>
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@ -3518,9 +3518,13 @@ static void btrfs_end_empty_barrier(struct bio *bio)
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*/
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static int write_dev_flush(struct btrfs_device *device, int wait)
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{
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struct request_queue *q = bdev_get_queue(device->bdev);
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struct bio *bio;
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int ret = 0;
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if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags))
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return 0;
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if (wait) {
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bio = device->flush_bio;
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if (!bio)
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