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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/fs/bcachefs/alloc_background_format.h
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/* SPDX-License-Identifier: GPL-2.0 */

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#ifndef _BCACHEFS_ALLOC_BACKGROUND_FORMAT_H

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#define _BCACHEFS_ALLOC_BACKGROUND_FORMAT_H

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struct bch_alloc {

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	struct bch_val		v;

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	__u8			fields;

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	__u8			gen;

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	__u8			data[];

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} __packed __aligned(8);

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#define BCH_ALLOC_FIELDS_V1()			\

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	x(read_time,		16)		\

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	x(write_time,		16)		\

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	x(data_type,		8)		\

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	x(dirty_sectors,	16)		\

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	x(cached_sectors,	16)		\

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	x(oldest_gen,		8)		\

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	x(stripe,		32)		\

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	x(stripe_redundancy,	8)

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enum {

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#define x(name, _bits) BCH_ALLOC_FIELD_V1_##name,

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	BCH_ALLOC_FIELDS_V1()

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#undef x

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};

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struct bch_alloc_v2 {

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	struct bch_val		v;

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	__u8			nr_fields;

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	__u8			gen;

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	__u8			oldest_gen;

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	__u8			data_type;

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	__u8			data[];

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} __packed __aligned(8);

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#define BCH_ALLOC_FIELDS_V2()			\

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	x(read_time,		64)		\

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	x(write_time,		64)		\

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	x(dirty_sectors,	32)		\

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	x(cached_sectors,	32)		\

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	x(stripe,		32)		\

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	x(stripe_redundancy,	8)

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struct bch_alloc_v3 {

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	struct bch_val		v;

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	__le64			journal_seq;

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	__le32			flags;

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	__u8			nr_fields;

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	__u8			gen;

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	__u8			oldest_gen;

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	__u8			data_type;

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	__u8			data[];

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} __packed __aligned(8);

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LE32_BITMASK(BCH_ALLOC_V3_NEED_DISCARD,struct bch_alloc_v3, flags,  0,  1)

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LE32_BITMASK(BCH_ALLOC_V3_NEED_INC_GEN,struct bch_alloc_v3, flags,  1,  2)

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struct bch_alloc_v4 {

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	struct bch_val		v;

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	__u64			journal_seq_nonempty;

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	__u32			flags;

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	__u8			gen;

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	__u8			oldest_gen;

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	__u8			data_type;

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	__u8			stripe_redundancy;

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	__u32			dirty_sectors;

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	__u32			cached_sectors;

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	__u64			io_time[2];

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	__u32			stripe;

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	__u32			nr_external_backpointers;

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	/* end of fields in original version of alloc_v4 */

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	__u64			journal_seq_empty;

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	__u32			stripe_sectors;

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	__u32			pad;

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} __packed __aligned(8);

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#define BCH_ALLOC_V4_U64s_V0	6

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#define BCH_ALLOC_V4_U64s	(sizeof(struct bch_alloc_v4) / sizeof(__u64))

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BITMASK(BCH_ALLOC_V4_NEED_DISCARD,	struct bch_alloc_v4, flags,  0,  1)

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BITMASK(BCH_ALLOC_V4_NEED_INC_GEN,	struct bch_alloc_v4, flags,  1,  2)

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BITMASK(BCH_ALLOC_V4_BACKPOINTERS_START,struct bch_alloc_v4, flags,  2,  8)

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BITMASK(BCH_ALLOC_V4_NR_BACKPOINTERS,	struct bch_alloc_v4, flags,  8,  14)

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#define KEY_TYPE_BUCKET_GENS_BITS	8

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#define KEY_TYPE_BUCKET_GENS_NR		(1U << KEY_TYPE_BUCKET_GENS_BITS)

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#define KEY_TYPE_BUCKET_GENS_MASK	(KEY_TYPE_BUCKET_GENS_NR - 1)

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struct bch_bucket_gens {

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	struct bch_val		v;

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	u8			gens[KEY_TYPE_BUCKET_GENS_NR];

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} __packed __aligned(8);

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#endif /* _BCACHEFS_ALLOC_BACKGROUND_FORMAT_H */

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