diff options
| -rw-r--r-- | drivers/block/loop.c | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/drivers/block/loop.c b/drivers/block/loop.c index bf034557767..9721d100caf 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -474,10 +474,35 @@ static int do_bio_filebacked(struct loop_device *lo, struct bio *bio) int ret; pos = ((loff_t) bio->bi_sector << 9) + lo->lo_offset; - if (bio_rw(bio) == WRITE) + + if (bio_rw(bio) == WRITE) { + int barrier = bio_barrier(bio); + struct file *file = lo->lo_backing_file; + + if (barrier) { + if (unlikely(!file->f_op->fsync)) { + ret = -EOPNOTSUPP; + goto out; + } + + ret = vfs_fsync(file, file->f_path.dentry, 0); + if (unlikely(ret)) { + ret = -EIO; + goto out; + } + } + ret = lo_send(lo, bio, pos); - else + + if (barrier && !ret) { + ret = vfs_fsync(file, file->f_path.dentry, 0); + if (unlikely(ret)) + ret = -EIO; + } + } else ret = lo_receive(lo, bio, lo->lo_blocksize, pos); + +out: return ret; } @@ -826,6 +851,9 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, lo->lo_queue->queuedata = lo; lo->lo_queue->unplug_fn = loop_unplug; + if (!(lo_flags & LO_FLAGS_READ_ONLY) && file->f_op->fsync) + blk_queue_ordered(lo->lo_queue, QUEUE_ORDERED_DRAIN, NULL); + set_capacity(lo->lo_disk, size); bd_set_size(bdev, size << 9); |