If a RAID setup has chunks that span multiple disks, and one of those disks has
failed, btrfs_chunk_readonly will return 1 since one of the disks in that
chunk's stripes is dead and therefore not writeable. So instead if we are in
degraded mode, return 0 so we can go ahead and allocate stuff. Without this
patch all of the block groups in a RAID1 setup will end up read-only, which will
mean we can't add new disks to the array since we won't be able to make
allocations.
Signed-off-by: Josef Bacik <josef@xxxxxxxxxx>
---
fs/btrfs/volumes.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 3dda2ce..68fe767 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2538,6 +2538,11 @@ int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset)
if (!em)
return 1;
+ if (btrfs_test_opt(root, DEGRADED)) {
+ free_extent_map(em);
+ return 0;
+ }
+
map = (struct map_lookup *)em->bdev;
for (i = 0; i < map->num_stripes; i++) {
if (!map->stripes[i].dev->writeable) {
--
1.5.4.3
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