This is to sync the data structure from bcache kernel code uapi header.
The new added struct cache_sb_disk is used to define the on-disk format
bcache super block. Later struct cache_sb will be used for the in-memory
format bcache super block.
Signed-off-by: Coly Li <colyli@xxxxxxx>
---
bcache.h | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 54 insertions(+)
diff --git a/bcache.h b/bcache.h
index c83f838..82fe580 100644
--- a/bcache.h
+++ b/bcache.h
@@ -7,6 +7,8 @@
#ifndef _BCACHE_H
#define _BCACHE_H
+#include <linux/types.h>
+
#define BITMASK(name, type, field, offset, size) \
static inline uint64_t name(const type *k) \
{ return (k->field >> offset) & ~(((uint64_t) ~0) << size); } \
@@ -40,6 +42,58 @@ static const char bcache_magic[] = {
#define BDEV_DATA_START_DEFAULT 16 /* sectors */
#define SB_START (SB_SECTOR * 512)
+struct cache_sb_disk {
+ __le64 csum;
+ __le64 offset; /* sector where this sb was written */
+ __le64 version;
+
+ __u8 magic[16];
+
+ __u8 uuid[16];
+ union {
+ __u8 set_uuid[16];
+ __le64 set_magic;
+ };
+ __u8 label[SB_LABEL_SIZE];
+
+ __le64 flags;
+ __le64 seq;
+
+ __le64 pad[8];
+
+ union {
+ struct {
+ /* Cache devices */
+ __le64 nbuckets; /* device size */
+
+ __le16 block_size; /* sectors */
+ __le16 bucket_size; /* sectors */
+
+ __le16 nr_in_set;
+ __le16 nr_this_dev;
+ };
+ struct {
+ /* Backing devices */
+ __le64 data_offset;
+
+ /*
+ * block_size from the cache device section is still used by
+ * backing devices, so don't add anything here until we fix
+ * things to not need it for backing devices anymore
+ */
+ };
+ };
+
+ __le32 last_mount; /* time overflow in y2106 */
+
+ __le16 first_bucket;
+ union {
+ __le16 njournal_buckets;
+ __le16 keys;
+ };
+ __le64 d[SB_JOURNAL_BUCKETS]; /* journal buckets */
+};
+
struct cache_sb {
uint64_t csum;
uint64_t offset; /* sector where this sb was written */
--
2.26.2
