From 18e503d695ff8ff9a43768555aa74575bf6b77f3 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Thu, 28 Oct 2010 15:30:42 -0400 Subject: [PATCH] Btrfs: fix raid code for removing missing drives When btrfs is mounted in degraded mode, it has some internal structures to track the missing devices. This missing device is setup as readonly, but the mapping code can get upset when we try to write to it. This changes the mapping code to return -EIO instead of oops when we try to write to the readonly device. Signed-off-by: Chris Mason --- fs/btrfs/volumes.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index dd318ff280b2..28681e729b1d 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -3034,8 +3034,7 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, } bio->bi_sector = multi->stripes[dev_nr].physical >> 9; dev = multi->stripes[dev_nr].dev; - BUG_ON(rw == WRITE && !dev->writeable); - if (dev && dev->bdev) { + if (dev && dev->bdev && (rw != WRITE || dev->writeable)) { bio->bi_bdev = dev->bdev; if (async_submit) schedule_bio(root, dev, rw, bio); -- 2.20.1