Currently we don't support writeback mode for zoned device as backing
device. So reject it by sysfs interface.
This rejection will be removed after the writeback cache mode support
for zoned device gets done.
Signed-off-by: Coly Li <colyli@xxxxxxx>
Cc: Damien Le Moal <damien.lemoal@xxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxxx>
Cc: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
---
drivers/md/bcache/sysfs.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index 323276994aab..41bdbc42a17d 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -359,6 +359,11 @@ STORE(__cached_dev)
if (v < 0)
return v;
+ if ((unsigned int) v == CACHE_MODE_WRITEBACK) {
+ pr_err("writeback mode is not supported for zoned backing device.\n");
+ return -ENOTSUPP;
+ }
+
if ((unsigned int) v != BDEV_CACHE_MODE(&dc->sb)) {
SET_BDEV_CACHE_MODE(&dc->sb, v);
bch_write_bdev_super(dc, NULL);
--
2.25.0
