From: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
commit 1d68128c107a0b8c0c9125cb05d4771ddc438369 upstream.
For zoned btrfs, zone append is mandatory to write to a sequential write
only zone, otherwise parallel writes to the same zone could result in
unaligned write errors.
If a zoned block device does not support zone append (e.g. a dm-crypt
zoned device using a non-NULL IV cypher), fail to mount.
CC: stable@xxxxxxxxxxxxxxx # 5.12
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/zoned.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -342,6 +342,13 @@ int btrfs_get_dev_zone_info(struct btrfs
if (!IS_ALIGNED(nr_sectors, zone_sectors))
zone_info->nr_zones++;
+ if (bdev_is_zoned(bdev) && zone_info->max_zone_append_size == 0) {
+ btrfs_err(fs_info, "zoned: device %pg does not support zone append",
+ bdev);
+ ret = -EINVAL;
+ goto out;
+ }
+
zone_info->seq_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
if (!zone_info->seq_zones) {
ret = -ENOMEM;
