bcachefs; extents_format.h
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet
parent
0560eb9abf
commit
b2fa1b633b
@ -417,272 +417,12 @@ struct bch_set {
|
||||
struct bch_val v;
|
||||
};
|
||||
|
||||
/* Extents */
|
||||
|
||||
/*
|
||||
* In extent bkeys, the value is a list of pointers (bch_extent_ptr), optionally
|
||||
* preceded by checksum/compression information (bch_extent_crc32 or
|
||||
* bch_extent_crc64).
|
||||
*
|
||||
* One major determining factor in the format of extents is how we handle and
|
||||
* represent extents that have been partially overwritten and thus trimmed:
|
||||
*
|
||||
* If an extent is not checksummed or compressed, when the extent is trimmed we
|
||||
* don't have to remember the extent we originally allocated and wrote: we can
|
||||
* merely adjust ptr->offset to point to the start of the data that is currently
|
||||
* live. The size field in struct bkey records the current (live) size of the
|
||||
* extent, and is also used to mean "size of region on disk that we point to" in
|
||||
* this case.
|
||||
*
|
||||
* Thus an extent that is not checksummed or compressed will consist only of a
|
||||
* list of bch_extent_ptrs, with none of the fields in
|
||||
* bch_extent_crc32/bch_extent_crc64.
|
||||
*
|
||||
* When an extent is checksummed or compressed, it's not possible to read only
|
||||
* the data that is currently live: we have to read the entire extent that was
|
||||
* originally written, and then return only the part of the extent that is
|
||||
* currently live.
|
||||
*
|
||||
* Thus, in addition to the current size of the extent in struct bkey, we need
|
||||
* to store the size of the originally allocated space - this is the
|
||||
* compressed_size and uncompressed_size fields in bch_extent_crc32/64. Also,
|
||||
* when the extent is trimmed, instead of modifying the offset field of the
|
||||
* pointer, we keep a second smaller offset field - "offset into the original
|
||||
* extent of the currently live region".
|
||||
*
|
||||
* The other major determining factor is replication and data migration:
|
||||
*
|
||||
* Each pointer may have its own bch_extent_crc32/64. When doing a replicated
|
||||
* write, we will initially write all the replicas in the same format, with the
|
||||
* same checksum type and compression format - however, when copygc runs later (or
|
||||
* tiering/cache promotion, anything that moves data), it is not in general
|
||||
* going to rewrite all the pointers at once - one of the replicas may be in a
|
||||
* bucket on one device that has very little fragmentation while another lives
|
||||
* in a bucket that has become heavily fragmented, and thus is being rewritten
|
||||
* sooner than the rest.
|
||||
*
|
||||
* Thus it will only move a subset of the pointers (or in the case of
|
||||
* tiering/cache promotion perhaps add a single pointer without dropping any
|
||||
* current pointers), and if the extent has been partially overwritten it must
|
||||
* write only the currently live portion (or copygc would not be able to reduce
|
||||
* fragmentation!) - which necessitates a different bch_extent_crc format for
|
||||
* the new pointer.
|
||||
*
|
||||
* But in the interests of space efficiency, we don't want to store one
|
||||
* bch_extent_crc for each pointer if we don't have to.
|
||||
*
|
||||
* Thus, a bch_extent consists of bch_extent_crc32s, bch_extent_crc64s, and
|
||||
* bch_extent_ptrs appended arbitrarily one after the other. We determine the
|
||||
* type of a given entry with a scheme similar to utf8 (except we're encoding a
|
||||
* type, not a size), encoding the type in the position of the first set bit:
|
||||
*
|
||||
* bch_extent_crc32 - 0b1
|
||||
* bch_extent_ptr - 0b10
|
||||
* bch_extent_crc64 - 0b100
|
||||
*
|
||||
* We do it this way because bch_extent_crc32 is _very_ constrained on bits (and
|
||||
* bch_extent_crc64 is the least constrained).
|
||||
*
|
||||
* Then, each bch_extent_crc32/64 applies to the pointers that follow after it,
|
||||
* until the next bch_extent_crc32/64.
|
||||
*
|
||||
* If there are no bch_extent_crcs preceding a bch_extent_ptr, then that pointer
|
||||
* is neither checksummed nor compressed.
|
||||
*/
|
||||
|
||||
/* 128 bits, sufficient for cryptographic MACs: */
|
||||
struct bch_csum {
|
||||
__le64 lo;
|
||||
__le64 hi;
|
||||
} __packed __aligned(8);
|
||||
|
||||
#define BCH_EXTENT_ENTRY_TYPES() \
|
||||
x(ptr, 0) \
|
||||
x(crc32, 1) \
|
||||
x(crc64, 2) \
|
||||
x(crc128, 3) \
|
||||
x(stripe_ptr, 4) \
|
||||
x(rebalance, 5)
|
||||
#define BCH_EXTENT_ENTRY_MAX 6
|
||||
|
||||
enum bch_extent_entry_type {
|
||||
#define x(f, n) BCH_EXTENT_ENTRY_##f = n,
|
||||
BCH_EXTENT_ENTRY_TYPES()
|
||||
#undef x
|
||||
};
|
||||
|
||||
/* Compressed/uncompressed size are stored biased by 1: */
|
||||
struct bch_extent_crc32 {
|
||||
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
||||
__u32 type:2,
|
||||
_compressed_size:7,
|
||||
_uncompressed_size:7,
|
||||
offset:7,
|
||||
_unused:1,
|
||||
csum_type:4,
|
||||
compression_type:4;
|
||||
__u32 csum;
|
||||
#elif defined (__BIG_ENDIAN_BITFIELD)
|
||||
__u32 csum;
|
||||
__u32 compression_type:4,
|
||||
csum_type:4,
|
||||
_unused:1,
|
||||
offset:7,
|
||||
_uncompressed_size:7,
|
||||
_compressed_size:7,
|
||||
type:2;
|
||||
#endif
|
||||
} __packed __aligned(8);
|
||||
|
||||
#define CRC32_SIZE_MAX (1U << 7)
|
||||
#define CRC32_NONCE_MAX 0
|
||||
|
||||
struct bch_extent_crc64 {
|
||||
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
||||
__u64 type:3,
|
||||
_compressed_size:9,
|
||||
_uncompressed_size:9,
|
||||
offset:9,
|
||||
nonce:10,
|
||||
csum_type:4,
|
||||
compression_type:4,
|
||||
csum_hi:16;
|
||||
#elif defined (__BIG_ENDIAN_BITFIELD)
|
||||
__u64 csum_hi:16,
|
||||
compression_type:4,
|
||||
csum_type:4,
|
||||
nonce:10,
|
||||
offset:9,
|
||||
_uncompressed_size:9,
|
||||
_compressed_size:9,
|
||||
type:3;
|
||||
#endif
|
||||
__u64 csum_lo;
|
||||
} __packed __aligned(8);
|
||||
|
||||
#define CRC64_SIZE_MAX (1U << 9)
|
||||
#define CRC64_NONCE_MAX ((1U << 10) - 1)
|
||||
|
||||
struct bch_extent_crc128 {
|
||||
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
||||
__u64 type:4,
|
||||
_compressed_size:13,
|
||||
_uncompressed_size:13,
|
||||
offset:13,
|
||||
nonce:13,
|
||||
csum_type:4,
|
||||
compression_type:4;
|
||||
#elif defined (__BIG_ENDIAN_BITFIELD)
|
||||
__u64 compression_type:4,
|
||||
csum_type:4,
|
||||
nonce:13,
|
||||
offset:13,
|
||||
_uncompressed_size:13,
|
||||
_compressed_size:13,
|
||||
type:4;
|
||||
#endif
|
||||
struct bch_csum csum;
|
||||
} __packed __aligned(8);
|
||||
|
||||
#define CRC128_SIZE_MAX (1U << 13)
|
||||
#define CRC128_NONCE_MAX ((1U << 13) - 1)
|
||||
|
||||
/*
|
||||
* @reservation - pointer hasn't been written to, just reserved
|
||||
*/
|
||||
struct bch_extent_ptr {
|
||||
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
||||
__u64 type:1,
|
||||
cached:1,
|
||||
unused:1,
|
||||
unwritten:1,
|
||||
offset:44, /* 8 petabytes */
|
||||
dev:8,
|
||||
gen:8;
|
||||
#elif defined (__BIG_ENDIAN_BITFIELD)
|
||||
__u64 gen:8,
|
||||
dev:8,
|
||||
offset:44,
|
||||
unwritten:1,
|
||||
unused:1,
|
||||
cached:1,
|
||||
type:1;
|
||||
#endif
|
||||
} __packed __aligned(8);
|
||||
|
||||
struct bch_extent_stripe_ptr {
|
||||
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
||||
__u64 type:5,
|
||||
block:8,
|
||||
redundancy:4,
|
||||
idx:47;
|
||||
#elif defined (__BIG_ENDIAN_BITFIELD)
|
||||
__u64 idx:47,
|
||||
redundancy:4,
|
||||
block:8,
|
||||
type:5;
|
||||
#endif
|
||||
};
|
||||
|
||||
struct bch_extent_rebalance {
|
||||
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
||||
__u64 type:6,
|
||||
unused:34,
|
||||
compression:8, /* enum bch_compression_opt */
|
||||
target:16;
|
||||
#elif defined (__BIG_ENDIAN_BITFIELD)
|
||||
__u64 target:16,
|
||||
compression:8,
|
||||
unused:34,
|
||||
type:6;
|
||||
#endif
|
||||
};
|
||||
|
||||
union bch_extent_entry {
|
||||
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ || __BITS_PER_LONG == 64
|
||||
unsigned long type;
|
||||
#elif __BITS_PER_LONG == 32
|
||||
struct {
|
||||
unsigned long pad;
|
||||
unsigned long type;
|
||||
};
|
||||
#else
|
||||
#error edit for your odd byteorder.
|
||||
#endif
|
||||
|
||||
#define x(f, n) struct bch_extent_##f f;
|
||||
BCH_EXTENT_ENTRY_TYPES()
|
||||
#undef x
|
||||
};
|
||||
|
||||
struct bch_btree_ptr {
|
||||
struct bch_val v;
|
||||
|
||||
__u64 _data[0];
|
||||
struct bch_extent_ptr start[];
|
||||
} __packed __aligned(8);
|
||||
|
||||
struct bch_btree_ptr_v2 {
|
||||
struct bch_val v;
|
||||
|
||||
__u64 mem_ptr;
|
||||
__le64 seq;
|
||||
__le16 sectors_written;
|
||||
__le16 flags;
|
||||
struct bpos min_key;
|
||||
__u64 _data[0];
|
||||
struct bch_extent_ptr start[];
|
||||
} __packed __aligned(8);
|
||||
|
||||
LE16_BITMASK(BTREE_PTR_RANGE_UPDATED, struct bch_btree_ptr_v2, flags, 0, 1);
|
||||
|
||||
struct bch_extent {
|
||||
struct bch_val v;
|
||||
|
||||
__u64 _data[0];
|
||||
union bch_extent_entry start[];
|
||||
} __packed __aligned(8);
|
||||
|
||||
struct bch_reservation {
|
||||
struct bch_val v;
|
||||
|
||||
@ -691,25 +431,6 @@ struct bch_reservation {
|
||||
__u8 pad[3];
|
||||
} __packed __aligned(8);
|
||||
|
||||
/* Maximum size (in u64s) a single pointer could be: */
|
||||
#define BKEY_EXTENT_PTR_U64s_MAX\
|
||||
((sizeof(struct bch_extent_crc128) + \
|
||||
sizeof(struct bch_extent_ptr)) / sizeof(__u64))
|
||||
|
||||
/* Maximum possible size of an entire extent value: */
|
||||
#define BKEY_EXTENT_VAL_U64s_MAX \
|
||||
(1 + BKEY_EXTENT_PTR_U64s_MAX * (BCH_REPLICAS_MAX + 1))
|
||||
|
||||
/* * Maximum possible size of an entire extent, key + value: */
|
||||
#define BKEY_EXTENT_U64s_MAX (BKEY_U64s + BKEY_EXTENT_VAL_U64s_MAX)
|
||||
|
||||
/* Btree pointers don't carry around checksums: */
|
||||
#define BKEY_BTREE_PTR_VAL_U64s_MAX \
|
||||
((sizeof(struct bch_btree_ptr_v2) + \
|
||||
sizeof(struct bch_extent_ptr) * BCH_REPLICAS_MAX) / sizeof(__u64))
|
||||
#define BKEY_BTREE_PTR_U64s_MAX \
|
||||
(BKEY_U64s + BKEY_BTREE_PTR_VAL_U64s_MAX)
|
||||
|
||||
struct bch_backpointer {
|
||||
struct bch_val v;
|
||||
__u8 btree_id;
|
||||
@ -720,6 +441,8 @@ struct bch_backpointer {
|
||||
struct bpos pos;
|
||||
} __packed __aligned(8);
|
||||
|
||||
#include "extents_format.h"
|
||||
|
||||
/* Reflink: */
|
||||
|
||||
struct bch_reflink_p {
|
||||
|
||||
282
fs/bcachefs/extents_format.h
Normal file
282
fs/bcachefs/extents_format.h
Normal file
@ -0,0 +1,282 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
#ifndef _BCACHEFS_EXTENTS_FORMAT_H
|
||||
#define _BCACHEFS_EXTENTS_FORMAT_H
|
||||
|
||||
/*
|
||||
* In extent bkeys, the value is a list of pointers (bch_extent_ptr), optionally
|
||||
* preceded by checksum/compression information (bch_extent_crc32 or
|
||||
* bch_extent_crc64).
|
||||
*
|
||||
* One major determining factor in the format of extents is how we handle and
|
||||
* represent extents that have been partially overwritten and thus trimmed:
|
||||
*
|
||||
* If an extent is not checksummed or compressed, when the extent is trimmed we
|
||||
* don't have to remember the extent we originally allocated and wrote: we can
|
||||
* merely adjust ptr->offset to point to the start of the data that is currently
|
||||
* live. The size field in struct bkey records the current (live) size of the
|
||||
* extent, and is also used to mean "size of region on disk that we point to" in
|
||||
* this case.
|
||||
*
|
||||
* Thus an extent that is not checksummed or compressed will consist only of a
|
||||
* list of bch_extent_ptrs, with none of the fields in
|
||||
* bch_extent_crc32/bch_extent_crc64.
|
||||
*
|
||||
* When an extent is checksummed or compressed, it's not possible to read only
|
||||
* the data that is currently live: we have to read the entire extent that was
|
||||
* originally written, and then return only the part of the extent that is
|
||||
* currently live.
|
||||
*
|
||||
* Thus, in addition to the current size of the extent in struct bkey, we need
|
||||
* to store the size of the originally allocated space - this is the
|
||||
* compressed_size and uncompressed_size fields in bch_extent_crc32/64. Also,
|
||||
* when the extent is trimmed, instead of modifying the offset field of the
|
||||
* pointer, we keep a second smaller offset field - "offset into the original
|
||||
* extent of the currently live region".
|
||||
*
|
||||
* The other major determining factor is replication and data migration:
|
||||
*
|
||||
* Each pointer may have its own bch_extent_crc32/64. When doing a replicated
|
||||
* write, we will initially write all the replicas in the same format, with the
|
||||
* same checksum type and compression format - however, when copygc runs later (or
|
||||
* tiering/cache promotion, anything that moves data), it is not in general
|
||||
* going to rewrite all the pointers at once - one of the replicas may be in a
|
||||
* bucket on one device that has very little fragmentation while another lives
|
||||
* in a bucket that has become heavily fragmented, and thus is being rewritten
|
||||
* sooner than the rest.
|
||||
*
|
||||
* Thus it will only move a subset of the pointers (or in the case of
|
||||
* tiering/cache promotion perhaps add a single pointer without dropping any
|
||||
* current pointers), and if the extent has been partially overwritten it must
|
||||
* write only the currently live portion (or copygc would not be able to reduce
|
||||
* fragmentation!) - which necessitates a different bch_extent_crc format for
|
||||
* the new pointer.
|
||||
*
|
||||
* But in the interests of space efficiency, we don't want to store one
|
||||
* bch_extent_crc for each pointer if we don't have to.
|
||||
*
|
||||
* Thus, a bch_extent consists of bch_extent_crc32s, bch_extent_crc64s, and
|
||||
* bch_extent_ptrs appended arbitrarily one after the other. We determine the
|
||||
* type of a given entry with a scheme similar to utf8 (except we're encoding a
|
||||
* type, not a size), encoding the type in the position of the first set bit:
|
||||
*
|
||||
* bch_extent_crc32 - 0b1
|
||||
* bch_extent_ptr - 0b10
|
||||
* bch_extent_crc64 - 0b100
|
||||
*
|
||||
* We do it this way because bch_extent_crc32 is _very_ constrained on bits (and
|
||||
* bch_extent_crc64 is the least constrained).
|
||||
*
|
||||
* Then, each bch_extent_crc32/64 applies to the pointers that follow after it,
|
||||
* until the next bch_extent_crc32/64.
|
||||
*
|
||||
* If there are no bch_extent_crcs preceding a bch_extent_ptr, then that pointer
|
||||
* is neither checksummed nor compressed.
|
||||
*/
|
||||
|
||||
#define BCH_EXTENT_ENTRY_TYPES() \
|
||||
x(ptr, 0) \
|
||||
x(crc32, 1) \
|
||||
x(crc64, 2) \
|
||||
x(crc128, 3) \
|
||||
x(stripe_ptr, 4) \
|
||||
x(rebalance, 5)
|
||||
#define BCH_EXTENT_ENTRY_MAX 6
|
||||
|
||||
enum bch_extent_entry_type {
|
||||
#define x(f, n) BCH_EXTENT_ENTRY_##f = n,
|
||||
BCH_EXTENT_ENTRY_TYPES()
|
||||
#undef x
|
||||
};
|
||||
|
||||
/* Compressed/uncompressed size are stored biased by 1: */
|
||||
struct bch_extent_crc32 {
|
||||
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
||||
__u32 type:2,
|
||||
_compressed_size:7,
|
||||
_uncompressed_size:7,
|
||||
offset:7,
|
||||
_unused:1,
|
||||
csum_type:4,
|
||||
compression_type:4;
|
||||
__u32 csum;
|
||||
#elif defined (__BIG_ENDIAN_BITFIELD)
|
||||
__u32 csum;
|
||||
__u32 compression_type:4,
|
||||
csum_type:4,
|
||||
_unused:1,
|
||||
offset:7,
|
||||
_uncompressed_size:7,
|
||||
_compressed_size:7,
|
||||
type:2;
|
||||
#endif
|
||||
} __packed __aligned(8);
|
||||
|
||||
#define CRC32_SIZE_MAX (1U << 7)
|
||||
#define CRC32_NONCE_MAX 0
|
||||
|
||||
struct bch_extent_crc64 {
|
||||
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
||||
__u64 type:3,
|
||||
_compressed_size:9,
|
||||
_uncompressed_size:9,
|
||||
offset:9,
|
||||
nonce:10,
|
||||
csum_type:4,
|
||||
compression_type:4,
|
||||
csum_hi:16;
|
||||
#elif defined (__BIG_ENDIAN_BITFIELD)
|
||||
__u64 csum_hi:16,
|
||||
compression_type:4,
|
||||
csum_type:4,
|
||||
nonce:10,
|
||||
offset:9,
|
||||
_uncompressed_size:9,
|
||||
_compressed_size:9,
|
||||
type:3;
|
||||
#endif
|
||||
__u64 csum_lo;
|
||||
} __packed __aligned(8);
|
||||
|
||||
#define CRC64_SIZE_MAX (1U << 9)
|
||||
#define CRC64_NONCE_MAX ((1U << 10) - 1)
|
||||
|
||||
struct bch_extent_crc128 {
|
||||
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
||||
__u64 type:4,
|
||||
_compressed_size:13,
|
||||
_uncompressed_size:13,
|
||||
offset:13,
|
||||
nonce:13,
|
||||
csum_type:4,
|
||||
compression_type:4;
|
||||
#elif defined (__BIG_ENDIAN_BITFIELD)
|
||||
__u64 compression_type:4,
|
||||
csum_type:4,
|
||||
nonce:13,
|
||||
offset:13,
|
||||
_uncompressed_size:13,
|
||||
_compressed_size:13,
|
||||
type:4;
|
||||
#endif
|
||||
struct bch_csum csum;
|
||||
} __packed __aligned(8);
|
||||
|
||||
#define CRC128_SIZE_MAX (1U << 13)
|
||||
#define CRC128_NONCE_MAX ((1U << 13) - 1)
|
||||
|
||||
/*
|
||||
* @reservation - pointer hasn't been written to, just reserved
|
||||
*/
|
||||
struct bch_extent_ptr {
|
||||
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
||||
__u64 type:1,
|
||||
cached:1,
|
||||
unused:1,
|
||||
unwritten:1,
|
||||
offset:44, /* 8 petabytes */
|
||||
dev:8,
|
||||
gen:8;
|
||||
#elif defined (__BIG_ENDIAN_BITFIELD)
|
||||
__u64 gen:8,
|
||||
dev:8,
|
||||
offset:44,
|
||||
unwritten:1,
|
||||
unused:1,
|
||||
cached:1,
|
||||
type:1;
|
||||
#endif
|
||||
} __packed __aligned(8);
|
||||
|
||||
struct bch_extent_stripe_ptr {
|
||||
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
||||
__u64 type:5,
|
||||
block:8,
|
||||
redundancy:4,
|
||||
idx:47;
|
||||
#elif defined (__BIG_ENDIAN_BITFIELD)
|
||||
__u64 idx:47,
|
||||
redundancy:4,
|
||||
block:8,
|
||||
type:5;
|
||||
#endif
|
||||
};
|
||||
|
||||
struct bch_extent_rebalance {
|
||||
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
||||
__u64 type:6,
|
||||
unused:34,
|
||||
compression:8, /* enum bch_compression_opt */
|
||||
target:16;
|
||||
#elif defined (__BIG_ENDIAN_BITFIELD)
|
||||
__u64 target:16,
|
||||
compression:8,
|
||||
unused:34,
|
||||
type:6;
|
||||
#endif
|
||||
};
|
||||
|
||||
union bch_extent_entry {
|
||||
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ || __BITS_PER_LONG == 64
|
||||
unsigned long type;
|
||||
#elif __BITS_PER_LONG == 32
|
||||
struct {
|
||||
unsigned long pad;
|
||||
unsigned long type;
|
||||
};
|
||||
#else
|
||||
#error edit for your odd byteorder.
|
||||
#endif
|
||||
|
||||
#define x(f, n) struct bch_extent_##f f;
|
||||
BCH_EXTENT_ENTRY_TYPES()
|
||||
#undef x
|
||||
};
|
||||
|
||||
struct bch_btree_ptr {
|
||||
struct bch_val v;
|
||||
|
||||
__u64 _data[0];
|
||||
struct bch_extent_ptr start[];
|
||||
} __packed __aligned(8);
|
||||
|
||||
struct bch_btree_ptr_v2 {
|
||||
struct bch_val v;
|
||||
|
||||
__u64 mem_ptr;
|
||||
__le64 seq;
|
||||
__le16 sectors_written;
|
||||
__le16 flags;
|
||||
struct bpos min_key;
|
||||
__u64 _data[0];
|
||||
struct bch_extent_ptr start[];
|
||||
} __packed __aligned(8);
|
||||
|
||||
LE16_BITMASK(BTREE_PTR_RANGE_UPDATED, struct bch_btree_ptr_v2, flags, 0, 1);
|
||||
|
||||
struct bch_extent {
|
||||
struct bch_val v;
|
||||
|
||||
__u64 _data[0];
|
||||
union bch_extent_entry start[];
|
||||
} __packed __aligned(8);
|
||||
|
||||
/* Maximum size (in u64s) a single pointer could be: */
|
||||
#define BKEY_EXTENT_PTR_U64s_MAX\
|
||||
((sizeof(struct bch_extent_crc128) + \
|
||||
sizeof(struct bch_extent_ptr)) / sizeof(__u64))
|
||||
|
||||
/* Maximum possible size of an entire extent value: */
|
||||
#define BKEY_EXTENT_VAL_U64s_MAX \
|
||||
(1 + BKEY_EXTENT_PTR_U64s_MAX * (BCH_REPLICAS_MAX + 1))
|
||||
|
||||
/* * Maximum possible size of an entire extent, key + value: */
|
||||
#define BKEY_EXTENT_U64s_MAX (BKEY_U64s + BKEY_EXTENT_VAL_U64s_MAX)
|
||||
|
||||
/* Btree pointers don't carry around checksums: */
|
||||
#define BKEY_BTREE_PTR_VAL_U64s_MAX \
|
||||
((sizeof(struct bch_btree_ptr_v2) + \
|
||||
sizeof(struct bch_extent_ptr) * BCH_REPLICAS_MAX) / sizeof(__u64))
|
||||
#define BKEY_BTREE_PTR_U64s_MAX \
|
||||
(BKEY_U64s + BKEY_BTREE_PTR_VAL_U64s_MAX)
|
||||
|
||||
#endif /* _BCACHEFS_EXTENTS_FORMAT_H */
|
||||
Loading…
Reference in New Issue
Block a user