Merge branch 'for-2.6.37/barrier' of git://git.kernel.dk/linux-2.6-block

* 'for-2.6.37/barrier' of git://git.kernel.dk/linux-2.6-block: (46 commits)
  xen-blkfront: disable barrier/flush write support
  Added blk-lib.c and blk-barrier.c was renamed to blk-flush.c
  block: remove BLKDEV_IFL_WAIT
  aic7xxx_old: removed unused 'req' variable
  block: remove the BH_Eopnotsupp flag
  block: remove the BLKDEV_IFL_BARRIER flag
  block: remove the WRITE_BARRIER flag
  swap: do not send discards as barriers
  fat: do not send discards as barriers
  ext4: do not send discards as barriers
  jbd2: replace barriers with explicit flush / FUA usage
  jbd2: Modify ASYNC_COMMIT code to not rely on queue draining on barrier
  jbd: replace barriers with explicit flush / FUA usage
  nilfs2: replace barriers with explicit flush / FUA usage
  reiserfs: replace barriers with explicit flush / FUA usage
  gfs2: replace barriers with explicit flush / FUA usage
  btrfs: replace barriers with explicit flush / FUA usage
  xfs: replace barriers with explicit flush / FUA usage
  block: pass gfp_mask and flags to sb_issue_discard
  dm: convey that all flushes are processed as empty
  ...

1 files changed, 10 insertions, 10 deletions

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index de3083b0a4f5..6c48b3545f84 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -479,17 +479,17 @@ static int do_bio_filebacked(struct loop_device *lo, struct bio *bio)
         pos = ((loff_t) bio->bi_sector << 9) + lo->lo_offset;
 
         if (bio_rw(bio) == WRITE) {
-                bool barrier = !!(bio->bi_rw & REQ_HARDBARRIER);
                 struct file *file = lo->lo_backing_file;
 
-                if (barrier) {
-                        if (unlikely(!file->f_op->fsync)) {
-                                ret = -EOPNOTSUPP;
-                                goto out;
-                        }
+                /* REQ_HARDBARRIER is deprecated */
+                if (bio->bi_rw & REQ_HARDBARRIER) {
+                        ret = -EOPNOTSUPP;
+                        goto out;
+                }
 
+                if (bio->bi_rw & REQ_FLUSH) {
                         ret = vfs_fsync(file, 0);
-                        if (unlikely(ret)) {
+                        if (unlikely(ret && ret != -EINVAL)) {
                                 ret = -EIO;
                                 goto out;
                         }
@@ -497,9 +497,9 @@ static int do_bio_filebacked(struct loop_device *lo, struct bio *bio)
 
                 ret = lo_send(lo, bio, pos);
 
-                if (barrier && !ret) {
+                if ((bio->bi_rw & REQ_FUA) && !ret) {
                         ret = vfs_fsync(file, 0);
-                        if (unlikely(ret))
+                        if (unlikely(ret && ret != -EINVAL))
                                 ret = -EIO;
                 }
         } else
@@ -931,7 +931,7 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
         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);
+                blk_queue_flush(lo->lo_queue, REQ_FLUSH);
 
         set_capacity(lo->lo_disk, size);
         bd_set_size(bdev, size << 9);