[Devel] [RFC PATCH vz9 v6 52/62] dm-ploop: resize operation - add holes bitmap locking

[Alexander Atanasov]

lock bitmap in grow update header and disable delayed writeback

https://virtuozzo.atlassian.net/browse/VSTOR-91821
Signed-off-by: Alexander Atanasov <alexander.atanasov at virtuozzo.com>
---
 drivers/md/dm-ploop-cmd.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/md/dm-ploop-cmd.c b/drivers/md/dm-ploop-cmd.c
index 78cdcc81c75f..c919d796e108 100644
--- a/drivers/md/dm-ploop-cmd.c
+++ b/drivers/md/dm-ploop-cmd.c
@@ -294,19 +294,24 @@ static int ploop_grow_relocate_cluster(struct ploop *ploop,
 
 	dst_clu = cmd->resize.dst_clu;
 
+	spin_lock_irq(&ploop->bat_lock);
+
 	/* Relocate clu and update index */
 	clu = ploop_find_bat_entry(ploop, dst_clu, &is_locked);
 	if (clu == UINT_MAX || is_locked) {
 		/* dst_clu in top delta is not occupied? */
 		if (!test_bit(dst_clu, ploop->holes_bitmap) || is_locked) {
 			WARN_ON_ONCE(1);
+			spin_unlock_irq(&ploop->bat_lock);
 			ret = -EIO;
 			goto out;
 		}
 		/* Cluster is free, occupy it. Skip relocaton */
 		ploop_hole_clear_bit(dst_clu, ploop);
+		spin_unlock_irq(&ploop->bat_lock);
 		goto not_occupied;
 	}
+	spin_unlock_irq(&ploop->bat_lock);
 
 	/* Read full clu sync */
 	ret = ploop_read_cluster_sync(ploop, pio, dst_clu);
@@ -438,6 +443,7 @@ static int ploop_process_resize_cmd(struct ploop *ploop, struct ploop_cmd *cmd)
 	u32 dst_clu;
 	int ret = 0;
 
+	ploop_disable_writeback_delay(ploop);
 	/* Update memory arrays and hb_nr, but do not update nr_bat_entries. */
 	ploop_advance_holes_bitmap(ploop, cmd);
 
@@ -466,6 +472,8 @@ static int ploop_process_resize_cmd(struct ploop *ploop, struct ploop_cmd *cmd)
 	}
 	spin_unlock_irq(&ploop->bat_lock);
 
+	ploop_enable_writeback_delay(ploop);
+
 	return ret;
 }
 ALLOW_ERROR_INJECTION(ploop_process_resize_cmd, ERRNO);
-- 
2.43.0