disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/include/uapi/linux/bcache.h
..
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@@ -141,13 +141,16 @@
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  * Version 3: Cache device with new UUID format
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  * Version 4: Backing device with data offset
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  */
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-#define BCACHE_SB_VERSION_CDEV		0
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-#define BCACHE_SB_VERSION_BDEV		1
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-#define BCACHE_SB_VERSION_CDEV_WITH_UUID 3
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-#define BCACHE_SB_VERSION_BDEV_WITH_OFFSET 4
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-#define BCACHE_SB_MAX_VERSION		4
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+#define BCACHE_SB_VERSION_CDEV			0
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+#define BCACHE_SB_VERSION_BDEV			1
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+#define BCACHE_SB_VERSION_CDEV_WITH_UUID	3
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+#define BCACHE_SB_VERSION_BDEV_WITH_OFFSET	4
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+#define BCACHE_SB_VERSION_CDEV_WITH_FEATURES	5
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+#define BCACHE_SB_VERSION_BDEV_WITH_FEATURES	6
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+#define BCACHE_SB_MAX_VERSION			6
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 #define SB_SECTOR			8
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+#define SB_OFFSET			(SB_SECTOR << SECTOR_SHIFT)
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 #define SB_SIZE				4096
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 #define SB_LABEL_SIZE			32
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 #define SB_JOURNAL_BUCKETS		256U
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@@ -156,8 +159,70 @@
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 #define BDEV_DATA_START_DEFAULT		16	/* sectors */
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+struct cache_sb_disk {
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+	__le64			csum;
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+	__le64			offset;	/* sector where this sb was written */
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+	__le64			version;
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+
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+	__u8			magic[16];
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+
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+	__u8			uuid[16];
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+	union {
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+		__u8		set_uuid[16];
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+		__le64		set_magic;
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+	};
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+	__u8			label[SB_LABEL_SIZE];
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+
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+	__le64			flags;
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+	__le64			seq;
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+
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+	__le64			feature_compat;
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+	__le64			feature_incompat;
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+	__le64			feature_ro_compat;
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+
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+	__le64			pad[5];
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+
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+	union {
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+	struct {
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+		/* Cache devices */
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+		__le64		nbuckets;	/* device size */
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+
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+		__le16		block_size;	/* sectors */
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+		__le16		bucket_size;	/* sectors */
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+
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+		__le16		nr_in_set;
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+		__le16		nr_this_dev;
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+	};
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+	struct {
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+		/* Backing devices */
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+		__le64		data_offset;
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+
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+		/*
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+		 * block_size from the cache device section is still used by
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+		 * backing devices, so don't add anything here until we fix
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+		 * things to not need it for backing devices anymore
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+		 */
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+	};
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+	};
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+
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+	__le32			last_mount;	/* time overflow in y2106 */
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+
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+	__le16			first_bucket;
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+	union {
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+		__le16		njournal_buckets;
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+		__le16		keys;
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+	};
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+	__le64			d[SB_JOURNAL_BUCKETS];	/* journal buckets */
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+	__le16			obso_bucket_size_hi;	/* obsoleted */
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+};
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+
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+/*
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+ * This is for in-memory bcache super block.
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+ * NOTE: cache_sb is NOT exactly mapping to cache_sb_disk, the member
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+ *       size, ordering and even whole struct size may be different
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+ *       from cache_sb_disk.
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+ */
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 struct cache_sb {
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-	__u64			csum;
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 	__u64			offset;	/* sector where this sb was written */
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 	__u64			version;
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..
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@@ -172,7 +237,10 @@
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 	__u64			flags;
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 	__u64			seq;
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-	__u64			pad[8];
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+
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+	__u64			feature_compat;
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+	__u64			feature_incompat;
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+	__u64			feature_ro_compat;
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 	union {
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 	struct {
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@@ -180,10 +248,9 @@
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 		__u64		nbuckets;	/* device size */
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 		__u16		block_size;	/* sectors */
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-		__u16		bucket_size;	/* sectors */
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-
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 		__u16		nr_in_set;
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 		__u16		nr_this_dev;
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+		__u32		bucket_size;	/* sectors */
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 	};
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 	struct {
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 		/* Backing devices */
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@@ -210,7 +277,8 @@
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 static inline _Bool SB_IS_BDEV(const struct cache_sb *sb)
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 {
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 	return sb->version == BCACHE_SB_VERSION_BDEV
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-		|| sb->version == BCACHE_SB_VERSION_BDEV_WITH_OFFSET;
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+		|| sb->version == BCACHE_SB_VERSION_BDEV_WITH_OFFSET
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+		|| sb->version == BCACHE_SB_VERSION_BDEV_WITH_FEATURES;
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 }
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 BITMASK(CACHE_SYNC,			struct cache_sb, flags, 0, 1);