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bcache: increase super block version for cache device and backing device

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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,
        __le64                  feature_compat;
        __le64                  feature_incompat;
        __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@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Coly Li 2020-07-25 20:00:27 +08:00 • committed by Jens Axboe
parent 117f636ea6
commit d721a43ff6
3 changed files with 128 additions and 11 deletions
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29
include/uapi/linux/bcache.h
View file

@ -141,11 +141,13 @@ static inline struct bkey *bkey_idx(const struct bkey *k, unsigned int nr_keys)
* Version 3: Cache device with new UUID format
* Version 4: Backing device with data offset
*/
#define BCACHE_SB_VERSION_CDEV 0
#define BCACHE_SB_VERSION_BDEV 1
#define BCACHE_SB_VERSION_CDEV_WITH_UUID 3
#define BCACHE_SB_VERSION_BDEV_WITH_OFFSET 4
#define BCACHE_SB_MAX_VERSION 4
#define BCACHE_SB_VERSION_CDEV 0
#define BCACHE_SB_VERSION_BDEV 1
#define BCACHE_SB_VERSION_CDEV_WITH_UUID 3
#define BCACHE_SB_VERSION_BDEV_WITH_OFFSET 4
#define BCACHE_SB_VERSION_CDEV_WITH_FEATURES 5
#define BCACHE_SB_VERSION_BDEV_WITH_FEATURES 6
#define BCACHE_SB_MAX_VERSION 6
#define SB_SECTOR 8
#define SB_OFFSET (SB_SECTOR << SECTOR_SHIFT)
@ -173,7 +175,12 @@ struct cache_sb_disk {
__le64 flags;
__le64 seq;
__le64 pad[8];
__le64 feature_compat;
__le64 feature_incompat;
__le64 feature_ro_compat;
__le64 pad[5];
union {
struct {
@ -224,7 +231,12 @@ struct cache_sb {
__u64 flags;
__u64 seq;
__u64 pad[8];
__u64 feature_compat;
__u64 feature_incompat;
__u64 feature_ro_compat;
__u64 pad[5];
union {
struct {
@ -262,7 +274,8 @@ struct cache_sb {
static inline _Bool SB_IS_BDEV(const struct cache_sb *sb)
{
return sb->version == BCACHE_SB_VERSION_BDEV
|| sb->version == BCACHE_SB_VERSION_BDEV_WITH_OFFSET;
|| sb->version == BCACHE_SB_VERSION_BDEV_WITH_OFFSET
|| sb->version == BCACHE_SB_VERSION_BDEV_WITH_FEATURES;
}
BITMASK(CACHE_SYNC, struct cache_sb, flags, 0, 1);