From: Li Nan <linan122@xxxxxxxxxx>
The raid should not be opened anymore when it is about to be stopped.
However, other processes can open it again if the flag MD_CLOSING is
cleared before exiting. From now on, this flag will not be cleared when
the raid will be stopped.
Fixes: 065e519e71b2 ("md: MD_CLOSING needs to be cleared after called md_set_readonly or do_md_stop")
Signed-off-by: Li Nan <linan122@xxxxxxxxxx>
---
drivers/md/md.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 9bdd57324c37..4bf821b89415 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -6254,7 +6254,15 @@ static void md_clean(struct mddev *mddev)
mddev->persistent = 0;
mddev->level = LEVEL_NONE;
mddev->clevel[0] = 0;
- mddev->flags = 0;
+ /*
+ * Don't clear MD_CLOSING, or mddev can be opened again.
+ * 'hold_active != 0' means mddev is still in the creation
+ * process and will be used later.
+ */
+ if (mddev->hold_active)
+ mddev->flags = 0;
+ else
+ mddev->flags &= BIT_ULL_MASK(MD_CLOSING);
mddev->sb_flags = 0;
mddev->ro = MD_RDWR;
mddev->metadata_type[0] = 0;
@@ -7728,6 +7736,12 @@ static int md_ioctl(struct block_device *bdev, blk_mode_t mode,
case STOP_ARRAY:
err = do_md_stop(mddev, 0, bdev);
+ if (!err)
+ /*
+ * mddev has been stopped, keep flag the
+ * MD_CLOSING to prevent reuse.
+ */
+ did_set_md_closing = false;
goto unlock;
case STOP_ARRAY_RO:
--
2.39.2
