On 7/15/20 7:46 AM, Coly Li wrote:
The new added super block version BCACHE_SB_VERSION_BDEV_WITH_FEATURES (5) BCACHE_SB_VERSION_CDEV_WITH_FEATURES value (6), is for the feature set bits. Devices have super block version equal to the new version will have three new members for feature set bits in the on-disk super block, /*078*/ __le64 feature_compat; /*080*/ __le64 feature_incompat; /*088*/ __le64 feature_ro_compat; They are used for further new features which may introduce on-disk format change, and avoid unncessary super block version increase. The very basic features handling code skeleton is also initialized in this patch. Signed-off-by: Coly Li <colyli@xxxxxxx> --- drivers/md/bcache/features.h | 78 ++++++++++++++++++++++++++++++++++++ drivers/md/bcache/super.c | 32 +++++++++++++-- include/uapi/linux/bcache.h | 29 ++++++++++---- 3 files changed, 128 insertions(+), 11 deletions(-) create mode 100644 drivers/md/bcache/features.h
Reviewed-by: Hannes Reinecke <hare@xxxxxxx> Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking hare@xxxxxxx +49 911 74053 688 SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer
