btrfs: zoned: fix zone activation with missing devices

commit 2bbc4a45e5eb6b868357c1045bf6f38f6ba576e0 upstream.

If btrfs_zone_activate() is called with a filesystem that has missing
devices (e.g. a RAID file system mounted in degraded mode) it is accessing
the btrfs_device::zone_info pointer, which will not be set if the device in
question is missing.

Check if the device is present (by checking if it has a valid block
device pointer associated) and if not, skip zone activation for it.

Fixes: f9a912a3c45f ("btrfs: zoned: make zone activation multi stripe capable")
CC: stable@vger.kernel.org # 6.1+
Reviewed-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 69d03feea4e0ecfc84784943950b2bd39178bed8..9b834a1b84103d170d4b52566d3df9c235dfe229 100644 (file)
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -2107,6 +2107,9 @@ bool btrfs_zone_activate(struct btrfs_block_group *block_group)
                physical = map->stripes[i].physical;
                zinfo = device->zone_info;
 
+               if (!device->bdev)
+                       continue;
+
                if (zinfo->max_active_zones == 0)
                        continue;