[PATCH] writeback: don't warn on an unregistered BDI in __mark_inode_dirty

[Christoph Hellwig <hch@lst.de>]

BDIs get unregistered during device removal, and this WARN can be
trivially triggered by hot-removing a NVMe device while running fsx
It is otherwise harmless as we still hold a BDI reference, and the
writeback has been shut down already.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---

I have a vague memory someone else sent this patch alredy, but couldn't
find it in my mailing list folder.  But given that my current NVMe
tests trigger it easily I'd rather get it fixed ASAP.

 fs/fs-writeback.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index e6005c78bfa93e..acfb55834af23c 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -2321,10 +2321,6 @@ void __mark_inode_dirty(struct inode *inode, int flags)
 
 			wb = locked_inode_to_wb_and_lock_list(inode);
 
-			WARN((wb->bdi->capabilities & BDI_CAP_WRITEBACK) &&
-			     !test_bit(WB_registered, &wb->state),
-			     "bdi-%s not registered\n", bdi_dev_name(wb->bdi));
-
 			inode->dirtied_when = jiffies;
 			if (dirtytime)
 				inode->dirtied_time_when = jiffies;
-- 
2.28.0