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btrfs: zoned: fail mount if the device does not support zone append 

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@vger.kernel.org # 5.12
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2021-04-16 12:05:27 +09:00 committed by David Sterba
parent 061dde8245
commit 1d68128c10
1 changed files with 7 additions and 0 deletions
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7
fs/btrfs/zoned.c
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@ -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;