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path: root/drivers/block/loop.c
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Diffstat (limited to 'drivers/block/loop.c')
-rw-r--r--drivers/block/loop.c32
1 files changed, 30 insertions, 2 deletions
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index bf0345577672..9721d100caf1 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);