[Devel] [PATCH hci-8.1 v2 3/4] dm-ploop: drop the dead PLOOP_DELAYWB code

[Denis V. Lunev]

From: Denis V. Lunev <den at openvz.org>

"dm-ploop: disable metadata writeback delay" fenced the code that
published new mappings in the local BAT before their index writeback
completed with #ifdef PLOOP_DELAYWB, because the delay hung pios in
the md wait list. Nothing defines the macro, so the code is not built,
and the blocks keep describing a scheme the rest of the driver no
longer follows. Remove them.

https://virtuozzo.atlassian.net/browse/VSTOR-151979

Signed-off-by: Denis V. Lunev <den at openvz.org>

Feature: dm-ploop: ploop target driver
---
 drivers/md/dm-ploop-map.c | 29 -----------------------------
 1 file changed, 29 deletions(-)

diff --git a/drivers/md/dm-ploop-map.c b/drivers/md/dm-ploop-map.c
index 34bf6487107f..2f8abfa8905b 100644
--- a/drivers/md/dm-ploop-map.c
+++ b/drivers/md/dm-ploop-map.c
@@ -840,10 +840,6 @@ static void ploop_advance_local_after_bat_wb(struct ploop *ploop,
 
 	/* holes bit map requires bat_lock */
 	spin_lock(&md->md_lock);
-#ifdef PLOOP_DELAYWB
-	if (piwb->type == PIWB_TYPE_ALLOC)
-		goto skip_apply;
-#endif
 	for (; i < last; i++) {
 		if (piwb->type == PIWB_TYPE_DISCARD) {
 			/* discard completed */
@@ -873,9 +869,6 @@ static void ploop_advance_local_after_bat_wb(struct ploop *ploop,
 			ploop_hole_set_bit(dst_clu[i], ploop);
 		}
 	}
-#ifdef PLOOP_DELAYWB
-skip_apply:
-#endif
 
 	WARN_ON_ONCE(!test_bit(MD_WRITEBACK, &md->status));
 
@@ -1347,10 +1340,6 @@ static int ploop_alloc_cluster(struct ploop *ploop, struct ploop_index_wb *piwb,
 	map_index_t *to;
 	int ret = 0;
 	u32 tmp_clu;
-#ifdef PLOOP_DELAYWB
-	unsigned long flags;
-	map_index_t *tomd;
-#endif
 
 	/* Cluster index related to the page[page_id] start */
 	clu -= piwb->page_id * PAGE_SIZE / sizeof(map_index_t) - PLOOP_MAP_OFFSET;
@@ -1371,13 +1360,6 @@ static int ploop_alloc_cluster(struct ploop *ploop, struct ploop_index_wb *piwb,
 		goto out;
 
 	WRITE_ONCE(to[clu], *dst_clu);
-#ifdef PLOOP_DELAYWB
-	spin_lock_irqsave(&piwb->md->md_lock, flags);
-	tomd = piwb->md->kmpage;
-	WRITE_ONCE(tomd[clu], *dst_clu);
-	WRITE_ONCE(piwb->md->bat_levels[clu], ploop_top_level(ploop));
-	spin_unlock_irqrestore(&piwb->md->md_lock, flags);
-#endif
 out:
 	kunmap_local(to);
 	return ret;
@@ -1686,15 +1668,6 @@ static void ploop_submit_cow_index_wb(struct ploop_cow *cow)
 	WRITE_ONCE(to[clu], cow->dst_clu);
 	kunmap_local(to);
 
-#ifdef PLOOP_DELAYWB
-	spin_lock_irqsave(&md->md_lock, flags);
-	to = md->kmpage;
-	WRITE_ONCE(to[clu], cow->dst_clu);
-	WRITE_ONCE(md->bat_levels[clu], ploop_top_level(ploop));
-	spin_unlock_irqrestore(&md->md_lock, flags);
-
-	ploop_md_up_prio(ploop, md);
-#endif
 	/* Prevent double clearing of holes_bitmap bit on complete_cow() */
 	cow->dst_clu = BAT_ENTRY_NONE;
 
@@ -1810,9 +1783,7 @@ static bool ploop_locate_new_cluster_and_attach_pio(struct ploop *ploop,
 		goto error;
 	}
 
-#ifndef PLOOP_DELAYWB
 	ploop_attach_end_action(pio, piwb);
-#endif
 	attached = true;
 	if (add_to_wblist)
 		ploop_add_dirty_for_wb(ploop, md);
-- 
2.53.0