From: Johannes Thumshirn <johannes.thumsh...@wdc.com>
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.
Signed-off-by: Johannes Thumshirn <johannes.thumsh...@wdc.com>
Signed-off-by: Damien Le Moal <damien.lem...@wdc.com>
---
fs/btrfs/zoned.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index eeb3ebe11d7a..70b23a0d03b1 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -342,6 +342,13 @@ int btrfs_get_dev_zone_info(struct btrfs_device *device)
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;
--
2.30.2
