mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 15:43:59 +08:00
59158fde42
Helper function to explicitly check how much space is free in a btree node Signed-off-by: Kent Overstreet <kmo@daterainc.com>
375 lines
8.0 KiB
C
375 lines
8.0 KiB
C
#ifndef _LINUX_BCACHE_H
|
|
#define _LINUX_BCACHE_H
|
|
|
|
/*
|
|
* Bcache on disk data structures
|
|
*/
|
|
|
|
#include <asm/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 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 */
|