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Edit File : bcache.h \| Size : 8.17 KB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note / #ifndef _LINUX_BCACHE_H #define _LINUX_BCACHE_H / * Bcache on disk data structures / #include <linux/types.h> #define BITMASK(name, type, field, offset, size) \ static __inline__ __u64 name(const type k) \ { return (k->field >> offset) & ~(~0ULL << size); } \ \ static __inline__ void SET_##name(type k, __u64 v) \ { \ k->field &= ~(~(~0ULL << size) << offset); \ k->field \|= (v & ~(~0ULL << size)) << offset; \ } / Btree keys - all units are in sectors / struct bkey { __u64 high; __u64 low; __u64 ptr[]; }; #define KEY_FIELD(name, field, offset, size) \ BITMASK(name, struct bkey, field, offset, size) #define PTR_FIELD(name, offset, size) \ static __inline__ __u64 name(const struct bkey k, unsigned i) \ { return (k->ptr[i] >> offset) & ~(~0ULL << size); } \ \ static __inline__ void SET_##name(struct bkey k, unsigned i, __u64 v) \ { \ k->ptr[i] &= ~(~(~0ULL << size) << offset); \ k->ptr[i] \|= (v & ~(~0ULL << size)) << offset; \ } #define KEY_SIZE_BITS 16 #define KEY_MAX_U64S 8 KEY_FIELD(KEY_PTRS, high, 60, 3) KEY_FIELD(HEADER_SIZE, high, 58, 2) KEY_FIELD(KEY_CSUM, high, 56, 2) KEY_FIELD(KEY_PINNED, high, 55, 1) KEY_FIELD(KEY_DIRTY, high, 36, 1) KEY_FIELD(KEY_SIZE, high, 20, KEY_SIZE_BITS) KEY_FIELD(KEY_INODE, high, 0, 20) / Next time I change the on disk format, KEY_OFFSET() won't be 64 bits / static __inline__ __u64 KEY_OFFSET(const struct bkey k) { return k->low; } static __inline__ void SET_KEY_OFFSET(struct bkey k, __u64 v) { k->low = v; } / * The high bit being set is a relic from when we used it to do binary * searches - it told you where a key started. It's not used anymore, * and can probably be safely dropped. / #define KEY(inode, offset, size) \ ((struct bkey) { \ .high = (1ULL << 63) \| ((__u64) (size) << 20) \| (inode), \ .low = (offset) \ }) #define ZERO_KEY KEY(0, 0, 0) #define MAX_KEY_INODE (~(~0 << 20)) #define MAX_KEY_OFFSET (~0ULL >> 1) #define MAX_KEY KEY(MAX_KEY_INODE, MAX_KEY_OFFSET, 0) #define KEY_START(k) (KEY_OFFSET(k) - KEY_SIZE(k)) #define START_KEY(k) KEY(KEY_INODE(k), KEY_START(k), 0) #define PTR_DEV_BITS 12 PTR_FIELD(PTR_DEV, 51, PTR_DEV_BITS) PTR_FIELD(PTR_OFFSET, 8, 43) PTR_FIELD(PTR_GEN, 0, 8) #define PTR_CHECK_DEV ((1 << PTR_DEV_BITS) - 1) #define MAKE_PTR(gen, offset, dev) \ ((((__u64) dev) << 51) \| ((__u64) offset) << 8 \| gen) / Bkey utility code / static __inline__ unsigned long bkey_u64s(const struct bkey k) { return (sizeof(struct bkey) / sizeof(__u64)) + KEY_PTRS(k); } static __inline__ unsigned long bkey_bytes(const struct bkey k) { return bkey_u64s(k) sizeof(__u64); } #define bkey_copy(_dest, _src) memcpy(_dest, _src, bkey_bytes(_src)) static __inline__ void bkey_copy_key(struct bkey dest, const struct bkey src) { SET_KEY_INODE(dest, KEY_INODE(src)); SET_KEY_OFFSET(dest, KEY_OFFSET(src)); } static __inline__ struct bkey bkey_next(const struct bkey k) { __u64 d = (void ) k; return (struct bkey ) (d + bkey_u64s(k)); } static __inline__ struct bkey bkey_idx(const struct bkey k, unsigned nr_keys) { __u64 d = (void ) k; return (struct bkey ) (d + nr_keys); } /* Enough for a key with 6 pointers / #define BKEY_PAD 8 #define BKEY_PADDED(key) \ union { struct bkey key; __u64 key ## _pad[BKEY_PAD]; } / Superblock / / Version 0: Cache device * Version 1: Backing device * Version 2: Seed pointer into btree node checksum * 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 SB_SECTOR 8 #define SB_SIZE 4096 #define SB_LABEL_SIZE 32 #define SB_JOURNAL_BUCKETS 256U / SB_JOURNAL_BUCKETS must be divisible by BITS_PER_LONG / #define MAX_CACHES_PER_SET 8 #define BDEV_DATA_START_DEFAULT 16 / sectors / struct cache_sb { __u64 csum; __u64 offset; / sector where this sb was written / __u64 version; __u8 magic[16]; __u8 uuid[16]; union { __u8 set_uuid[16]; __u64 set_magic; }; __u8 label[SB_LABEL_SIZE]; __u64 flags; __u64 seq; __u64 pad[8]; union { struct { / Cache devices / __u64 nbuckets; / device size / __u16 block_size; / sectors / __u16 bucket_size; / sectors / __u16 nr_in_set; __u16 nr_this_dev; }; struct { / Backing devices / __u64 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 / }; }; __u32 last_mount; / time_t / __u16 first_bucket; union { __u16 njournal_buckets; __u16 keys; }; __u64 d[SB_JOURNAL_BUCKETS]; / journal buckets / }; 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; } BITMASK(CACHE_SYNC, struct cache_sb, flags, 0, 1); BITMASK(CACHE_DISCARD, struct cache_sb, flags, 1, 1); BITMASK(CACHE_REPLACEMENT, struct cache_sb, flags, 2, 3); #define CACHE_REPLACEMENT_LRU 0U #define CACHE_REPLACEMENT_FIFO 1U #define CACHE_REPLACEMENT_RANDOM 2U BITMASK(BDEV_CACHE_MODE, struct cache_sb, flags, 0, 4); #define CACHE_MODE_WRITETHROUGH 0U #define CACHE_MODE_WRITEBACK 1U #define CACHE_MODE_WRITEAROUND 2U #define CACHE_MODE_NONE 3U BITMASK(BDEV_STATE, struct cache_sb, flags, 61, 2); #define BDEV_STATE_NONE 0U #define BDEV_STATE_CLEAN 1U #define BDEV_STATE_DIRTY 2U #define BDEV_STATE_STALE 3U /* * Magic numbers * * The various other data structures have their own magic numbers, which are * xored with the first part of the cache set's UUID / #define JSET_MAGIC 0x245235c1a3625032ULL #define PSET_MAGIC 0x6750e15f87337f91ULL #define BSET_MAGIC 0x90135c78b99e07f5ULL static __inline__ __u64 jset_magic(struct cache_sb sb) { return sb->set_magic ^ JSET_MAGIC; } static __inline__ __u64 pset_magic(struct cache_sb sb) { return sb->set_magic ^ PSET_MAGIC; } static __inline__ __u64 bset_magic(struct cache_sb sb) { return sb->set_magic ^ BSET_MAGIC; } /* * Journal * * On disk format for a journal entry: * seq is monotonically increasing; every journal entry has its own unique * sequence number. * * last_seq is the oldest journal entry that still has keys the btree hasn't * flushed to disk yet. * * version is for on disk format changes. / #define BCACHE_JSET_VERSION_UUIDv1 1 #define BCACHE_JSET_VERSION_UUID 1 / Always latest UUID format / #define BCACHE_JSET_VERSION 1 struct jset { __u64 csum; __u64 magic; __u64 seq; __u32 version; __u32 keys; __u64 last_seq; BKEY_PADDED(uuid_bucket); BKEY_PADDED(btree_root); __u16 btree_level; __u16 pad[3]; __u64 prio_bucket[MAX_CACHES_PER_SET]; union { struct bkey start[0]; __u64 d[0]; }; }; / Bucket prios/gens / struct prio_set { __u64 csum; __u64 magic; __u64 seq; __u32 version; __u32 pad; __u64 next_bucket; struct bucket_disk { __u16 prio; __u8 gen; } __attribute((packed)) data[]; }; / UUIDS - per backing device/flash only volume metadata / struct uuid_entry { union { struct { __u8 uuid[16]; __u8 label[32]; __u32 first_reg; __u32 last_reg; __u32 invalidated; __u32 flags; / Size of flash only volumes / __u64 sectors; }; __u8 pad[128]; }; }; BITMASK(UUID_FLASH_ONLY, struct uuid_entry, flags, 0, 1); / Btree nodes / / Version 1: Seed pointer into btree node checksum / #define BCACHE_BSET_CSUM 1 #define BCACHE_BSET_VERSION 1 / * Btree nodes * * On disk a btree node is a list/log of these; within each set the keys are * sorted / struct bset { __u64 csum; __u64 magic; __u64 seq; __u32 version; __u32 keys; union { struct bkey start[0]; __u64 d[0]; }; }; / OBSOLETE / / UUIDS - per backing device/flash only volume metadata / struct uuid_entry_v0 { __u8 uuid[16]; __u8 label[32]; __u32 first_reg; __u32 last_reg; __u32 invalidated; __u32 pad; }; #endif / _LINUX_BCACHE_H */ Back

Edit File : bcache.h | Size : 8.17 KB

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _LINUX_BCACHE_H
#define _LINUX_BCACHE_H

/*
 * Bcache on disk data structures
 */

#include <linux/types.h>

#define BITMASK(name, type, field, offset, size)		\
static __inline__ __u64 name(const type *k)				\
{ return (k->field >> offset) & ~(~0ULL << size); }		\
								\
static __inline__ void SET_##name(type *k, __u64 v)			\
{								\
	k->field &= ~(~(~0ULL << size) << offset);		\
	k->field |= (v & ~(~0ULL << size)) << offset;		\
}

/* Btree keys - all units are in sectors */

struct bkey {
	__u64	high;
	__u64	low;
	__u64	ptr[];
};

#define KEY_FIELD(name, field, offset, size)				\
	BITMASK(name, struct bkey, field, offset, size)

#define PTR_FIELD(name, offset, size)					\
static __inline__ __u64 name(const struct bkey *k, unsigned i)		\
{ return (k->ptr[i] >> offset) & ~(~0ULL << size); }			\
									\
static __inline__ void SET_##name(struct bkey *k, unsigned i, __u64 v)	\
{									\
	k->ptr[i] &= ~(~(~0ULL << size) << offset);			\
	k->ptr[i] |= (v & ~(~0ULL << size)) << offset;			\
}

#define KEY_SIZE_BITS		16
#define KEY_MAX_U64S		8

KEY_FIELD(KEY_PTRS,	high, 60, 3)
KEY_FIELD(HEADER_SIZE,	high, 58, 2)
KEY_FIELD(KEY_CSUM,	high, 56, 2)
KEY_FIELD(KEY_PINNED,	high, 55, 1)
KEY_FIELD(KEY_DIRTY,	high, 36, 1)

KEY_FIELD(KEY_SIZE,	high, 20, KEY_SIZE_BITS)
KEY_FIELD(KEY_INODE,	high, 0,  20)

/* Next time I change the on disk format, KEY_OFFSET() won't be 64 bits */

static __inline__ __u64 KEY_OFFSET(const struct bkey *k)
{
	return k->low;
}

static __inline__ void SET_KEY_OFFSET(struct bkey *k, __u64 v)
{
	k->low = v;
}

/*
 * The high bit being set is a relic from when we used it to do binary
 * searches - it told you where a key started. It's not used anymore,
 * and can probably be safely dropped.
 */
#define KEY(inode, offset, size)					\
((struct bkey) {							\
	.high = (1ULL << 63) | ((__u64) (size) << 20) | (inode),	\
	.low = (offset)							\
})

#define ZERO_KEY			KEY(0, 0, 0)

#define MAX_KEY_INODE			(~(~0 << 20))
#define MAX_KEY_OFFSET			(~0ULL >> 1)
#define MAX_KEY				KEY(MAX_KEY_INODE, MAX_KEY_OFFSET, 0)

#define KEY_START(k)			(KEY_OFFSET(k) - KEY_SIZE(k))
#define START_KEY(k)			KEY(KEY_INODE(k), KEY_START(k), 0)

#define PTR_DEV_BITS			12

PTR_FIELD(PTR_DEV,			51, PTR_DEV_BITS)
PTR_FIELD(PTR_OFFSET,			8,  43)
PTR_FIELD(PTR_GEN,			0,  8)

#define PTR_CHECK_DEV			((1 << PTR_DEV_BITS) - 1)

#define MAKE_PTR(gen, offset, dev)					\
	((((__u64) dev) << 51) | ((__u64) offset) << 8 | gen)

/* Bkey utility code */

static __inline__ unsigned long bkey_u64s(const struct bkey *k)
{
	return (sizeof(struct bkey) / sizeof(__u64)) + KEY_PTRS(k);
}

static __inline__ unsigned long bkey_bytes(const struct bkey *k)
{
	return bkey_u64s(k) * sizeof(__u64);
}

#define bkey_copy(_dest, _src)	memcpy(_dest, _src, bkey_bytes(_src))

static __inline__ void bkey_copy_key(struct bkey *dest, const struct bkey *src)
{
	SET_KEY_INODE(dest, KEY_INODE(src));
	SET_KEY_OFFSET(dest, KEY_OFFSET(src));
}

static __inline__ struct bkey *bkey_next(const struct bkey *k)
{
	__u64 *d = (void *) k;
	return (struct bkey *) (d + bkey_u64s(k));
}

static __inline__ struct bkey *bkey_idx(const struct bkey *k, unsigned nr_keys)
{
	__u64 *d = (void *) k;
	return (struct bkey *) (d + nr_keys);
}
/* Enough for a key with 6 pointers */
#define BKEY_PAD		8

#define BKEY_PADDED(key)					\
	union { struct bkey key; __u64 key ## _pad[BKEY_PAD]; }

/* Superblock */

/* Version 0: Cache device
 * Version 1: Backing device
 * Version 2: Seed pointer into btree node checksum
 * 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 SB_SECTOR			8
#define SB_SIZE				4096
#define SB_LABEL_SIZE			32
#define SB_JOURNAL_BUCKETS		256U
/* SB_JOURNAL_BUCKETS must be divisible by BITS_PER_LONG */
#define MAX_CACHES_PER_SET		8

#define BDEV_DATA_START_DEFAULT		16	/* sectors */

struct cache_sb {
	__u64			csum;
	__u64			offset;	/* sector where this sb was written */
	__u64			version;

__u8			magic[16];

__u8			uuid[16];
	union {
		__u8		set_uuid[16];
		__u64		set_magic;
	};
	__u8			label[SB_LABEL_SIZE];

__u64			flags;
	__u64			seq;
	__u64			pad[8];

union {
	struct {
		/* Cache devices */
		__u64		nbuckets;	/* device size */

__u16		block_size;	/* sectors */
		__u16		bucket_size;	/* sectors */

__u16		nr_in_set;
		__u16		nr_this_dev;
	};
	struct {
		/* Backing devices */
		__u64		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
		 */
	};
	};

__u32			last_mount;	/* time_t */

__u16			first_bucket;
	union {
		__u16		njournal_buckets;
		__u16		keys;
	};
	__u64			d[SB_JOURNAL_BUCKETS];	/* journal buckets */
};

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;
}

BITMASK(CACHE_SYNC,			struct cache_sb, flags, 0, 1);
BITMASK(CACHE_DISCARD,			struct cache_sb, flags, 1, 1);
BITMASK(CACHE_REPLACEMENT,		struct cache_sb, flags, 2, 3);
#define CACHE_REPLACEMENT_LRU		0U
#define CACHE_REPLACEMENT_FIFO		1U
#define CACHE_REPLACEMENT_RANDOM	2U

BITMASK(BDEV_CACHE_MODE,		struct cache_sb, flags, 0, 4);
#define CACHE_MODE_WRITETHROUGH		0U
#define CACHE_MODE_WRITEBACK		1U
#define CACHE_MODE_WRITEAROUND		2U
#define CACHE_MODE_NONE			3U
BITMASK(BDEV_STATE,			struct cache_sb, flags, 61, 2);
#define BDEV_STATE_NONE			0U
#define BDEV_STATE_CLEAN		1U
#define BDEV_STATE_DIRTY		2U
#define BDEV_STATE_STALE		3U

/*
 * Magic numbers
 *
 * The various other data structures have their own magic numbers, which are
 * xored with the first part of the cache set's UUID
 */

#define JSET_MAGIC			0x245235c1a3625032ULL
#define PSET_MAGIC			0x6750e15f87337f91ULL
#define BSET_MAGIC			0x90135c78b99e07f5ULL

static __inline__ __u64 jset_magic(struct cache_sb *sb)
{
	return sb->set_magic ^ JSET_MAGIC;
}

static __inline__ __u64 pset_magic(struct cache_sb *sb)
{
	return sb->set_magic ^ PSET_MAGIC;
}

static __inline__ __u64 bset_magic(struct cache_sb *sb)
{
	return sb->set_magic ^ BSET_MAGIC;
}

/*
 * Journal
 *
 * On disk format for a journal entry:
 * seq is monotonically increasing; every journal entry has its own unique
 * sequence number.
 *
 * last_seq is the oldest journal entry that still has keys the btree hasn't
 * flushed to disk yet.
 *
 * version is for on disk format changes.
 */

#define BCACHE_JSET_VERSION_UUIDv1	1
#define BCACHE_JSET_VERSION_UUID	1	/* Always latest UUID format */
#define BCACHE_JSET_VERSION		1

struct jset {
	__u64			csum;
	__u64			magic;
	__u64			seq;
	__u32			version;
	__u32			keys;

__u64			last_seq;

BKEY_PADDED(uuid_bucket);
	BKEY_PADDED(btree_root);
	__u16			btree_level;
	__u16			pad[3];

__u64			prio_bucket[MAX_CACHES_PER_SET];

union {
		struct bkey	start[0];
		__u64		d[0];
	};
};

/* Bucket prios/gens */

struct prio_set {
	__u64			csum;
	__u64			magic;
	__u64			seq;
	__u32			version;
	__u32			pad;

__u64			next_bucket;

struct bucket_disk {
		__u16		prio;
		__u8		gen;
	} __attribute((packed)) data[];
};

/* UUIDS - per backing device/flash only volume metadata */

struct uuid_entry {
	union {
		struct {
			__u8	uuid[16];
			__u8	label[32];
			__u32	first_reg;
			__u32	last_reg;
			__u32	invalidated;

__u32	flags;
			/* Size of flash only volumes */
			__u64	sectors;
		};

__u8		pad[128];
	};
};

BITMASK(UUID_FLASH_ONLY,	struct uuid_entry, flags, 0, 1);

/* Btree nodes */

/* Version 1: Seed pointer into btree node checksum
 */
#define BCACHE_BSET_CSUM		1
#define BCACHE_BSET_VERSION		1

/*
 * Btree nodes
 *
 * On disk a btree node is a list/log of these; within each set the keys are
 * sorted
 */
struct bset {
	__u64			csum;
	__u64			magic;
	__u64			seq;
	__u32			version;
	__u32			keys;

union {
		struct bkey	start[0];
		__u64		d[0];
	};
};

/* OBSOLETE */

/* UUIDS - per backing device/flash only volume metadata */

struct uuid_entry_v0 {
	__u8		uuid[16];
	__u8		label[32];
	__u32		first_reg;
	__u32		last_reg;
	__u32		invalidated;
	__u32		pad;
};

#endif /* _LINUX_BCACHE_H */

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