On 12/21/20 10:48 PM, Naohiro Aota wrote:
This is preparation patch to implement zone emulation on a regular device. To emulate zoned mode on a regular (non-zoned) device, we need to decide an emulating zone size. Instead of making it compile-time static value, we'll make it configurable at mkfs time. Since we have one zone == one device extent restriction, we can determine the emulated zone size from the size of a device extent. We can extend btrfs_get_dev_zone_info() to show a regular device filled with conventional zones once the zone size is decided. The current call site of btrfs_get_dev_zone_info() during the mount process is earlier than reading the trees, so we can't slice a regular device to conventional zones. This patch defers the loading of zone info to open_ctree() to load the emulated zone size from a device extent. Signed-off-by: Naohiro Aota <naohiro.aota@xxxxxxx>
Reviewed-by: Josef Bacik <josef@xxxxxxxxxxxxxx> Thanks, Josef
