From: Yu Kuai <yukuai@fygo.io>
Reshape progress is tracked by array metadata rather than llbitmap.
Do not let llbitmap skip_sync_blocks() suppress reshape ranges based on
stale bitmap state before the corresponding checkpoint is persisted.
Signed-off-by: Yu Kuai <yukuai@fygo.io>
---
drivers/md/md-llbitmap.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/md/md-llbitmap.c b/drivers/md/md-llbitmap.c
index 76621a9fd645..67e63d81a824 100644
--- a/drivers/md/md-llbitmap.c
+++ b/drivers/md/md-llbitmap.c
@@ -1644,10 +1644,18 @@ static sector_t llbitmap_skip_sync_blocks(struct mddev *mddev, sector_t offset)
if (p >= llbitmap->chunks)
return 0;
c = llbitmap_read(llbitmap, p);
+ /*
+ * Reshape progress is tracked by array metadata rather than llbitmap.
+ * Skipping reshape ranges from stale bitmap state can lose data after a
+ * restart before the corresponding bits are checkpointed to disk.
+ */
+ if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
+ return 0;
+
/* always skip unwritten blocks */
if (c == BitUnwritten)
return blocks;
/* Skip CleanUnwritten - no user data, will be reset after recovery */
--
2.51.0