From b91a7bdca4439e286f26cdd6c15ed338e6a9fda2 Mon Sep 17 00:00:00 2001 From: Ilya Dryomov Date: Fri, 3 May 2019 17:27:03 +0200 Subject: rbd: don't assert on writes to snapshots The check added in commit 721c7fc701c7 ("block: fail op_is_write() requests to read-only partitions") was lifted in commit a32e236eb93e ("Partially revert "block: fail op_is_write() requests to read-only partitions""). Basic things like user triggered writes and discards are still caught, but internal kernel users can submit anything. In particular, ext4 will attempt to write to the superblock if it detects errors in the filesystem, even if the filesystem is mounted read-only on a read-only partition. The assert is overkill regardless. Signed-off-by: Ilya Dryomov --- drivers/block/rbd.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'drivers/block') diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 99de7166bf89..e5009a34f9c2 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -3842,8 +3842,12 @@ static void rbd_queue_workfn(struct work_struct *work) goto err_rq; } - rbd_assert(op_type == OBJ_OP_READ || - rbd_dev->spec->snap_id == CEPH_NOSNAP); + if (op_type != OBJ_OP_READ && rbd_dev->spec->snap_id != CEPH_NOSNAP) { + rbd_warn(rbd_dev, "%s on read-only snapshot", + obj_op_name(op_type)); + result = -EIO; + goto err; + } /* * Quit early if the mapped snapshot no longer exists. It's -- cgit v1.2.3