From 44aa6154e17e8831a1168e600deaff7dcb052a18 Mon Sep 17 00:00:00 2001 From: Yu Kuai Date: Mon, 3 Aug 2026 03:50:29 +0800 Subject: [PATCH] md/md-llbitmap: don't skip reshape ranges from bitmap state 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. Tested-by: Mykola Marzhan Link: https://patch.msgid.link/20260802195038.164272-21-yukuai@kernel.org Signed-off-by: Yu Kuai --- 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 1283ad737692..a609e8d44901 100644 --- a/drivers/md/md-llbitmap.c +++ b/drivers/md/md-llbitmap.c @@ -1707,6 +1707,14 @@ static sector_t llbitmap_skip_sync_blocks(struct mddev *mddev, sector_t offset) 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;