6.1-stable review patch. If anyone has any objections, please let me know.
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From: Johannes Thumshirn johannes.thumshirn@wdc.com
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 --- fs/btrfs/zoned.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/fs/btrfs/zoned.c +++ b/fs/btrfs/zoned.c @@ -1909,6 +1909,9 @@ bool btrfs_zone_activate(struct btrfs_bl device = map->stripes[i].dev; physical = map->stripes[i].physical;
+ if (!device->bdev) + continue; + if (device->zone_info->max_active_zones == 0) continue;