dm: remove unused flush_all

This patch removes the DM_WQ_FLUSH_ALL state that is unnecessary.

The dm_queue_flush(md, DM_WQ_FLUSH_ALL, NULL) in dm_suspend()
is never invoked because:
  - 'goto flush_and_out' is the same as 'goto out' because
    the 'goto flush_and_out' is called only when '!noflush'
  - If r is non-zero, then the code above will invoke 'goto out'
    and skip this code.

No functional change.

Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 1 insertions, 13 deletions

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 829d9fc6645..6938bfeb5e2 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -76,7 +76,6 @@ union map_info *dm_get_mapinfo(struct bio *bio)
  */
 struct dm_wq_req {
         enum {
-                DM_WQ_FLUSH_ALL,
                 DM_WQ_FLUSH_DEFERRED,
         } type;
         struct work_struct work;
@@ -1395,9 +1394,6 @@ static void dm_wq_work(struct work_struct *work)
 
         down_write(&md->io_lock);
         switch (req->type) {
-        case DM_WQ_FLUSH_ALL:
-                __merge_pushback_list(md);
-                /* pass through */
         case DM_WQ_FLUSH_DEFERRED:
                 __flush_deferred_io(md);
                 break;
@@ -1527,7 +1523,7 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
                 if (!md->suspended_bdev) {
                         DMWARN("bdget failed in dm_suspend");
                         r = -ENOMEM;
-                        goto flush_and_out;
+                        goto out;
                 }
 
                 /*
@@ -1578,14 +1574,6 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
 
         set_bit(DMF_SUSPENDED, &md->flags);
 
-flush_and_out:
-        if (r && noflush)
-                /*
-                 * Because there may be already I/Os in the pushback list,
-                 * flush them before return.
-                 */
-                dm_queue_flush(md, DM_WQ_FLUSH_ALL, NULL);
-
 out:
         if (r && md->suspended_bdev) {
                 bdput(md->suspended_bdev);