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Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _BCACHEFS_SUPER_IO_H
3#define _BCACHEFS_SUPER_IO_H
4
5#include "extents.h"
6#include "eytzinger.h"
7#include "super_types.h"
8#include "super.h"
9#include "sb-members.h"
10
11#include <asm/byteorder.h>
12
13#define BCH_SB_READ_SCRATCH_BUF_SIZE 4096
14
15static inline bool bch2_version_compatible(u16 version)
16{
17 return BCH_VERSION_MAJOR(version) <= BCH_VERSION_MAJOR(bcachefs_metadata_version_current) &&
18 version >= bcachefs_metadata_version_min;
19}
20
21void bch2_version_to_text(struct printbuf *, enum bcachefs_metadata_version);
22enum bcachefs_metadata_version bch2_latest_compatible_version(enum bcachefs_metadata_version);
23
24bool bch2_set_version_incompat(struct bch_fs *, enum bcachefs_metadata_version);
25
26static inline bool bch2_request_incompat_feature(struct bch_fs *c,
27 enum bcachefs_metadata_version version)
28{
29 return likely(version <= c->sb.version_incompat)
30 ? true
31 : bch2_set_version_incompat(c, version);
32}
33
34static inline size_t bch2_sb_field_bytes(struct bch_sb_field *f)
35{
36 return le32_to_cpu(f->u64s) * sizeof(u64);
37}
38
39#define field_to_type(_f, _name) \
40 container_of_or_null(_f, struct bch_sb_field_##_name, field)
41
42struct bch_sb_field *bch2_sb_field_get_id(struct bch_sb *, enum bch_sb_field_type);
43#define bch2_sb_field_get(_sb, _name) \
44 field_to_type(bch2_sb_field_get_id(_sb, BCH_SB_FIELD_##_name), _name)
45
46struct bch_sb_field *bch2_sb_field_resize_id(struct bch_sb_handle *,
47 enum bch_sb_field_type, unsigned);
48#define bch2_sb_field_resize(_sb, _name, _u64s) \
49 field_to_type(bch2_sb_field_resize_id(_sb, BCH_SB_FIELD_##_name, _u64s), _name)
50
51struct bch_sb_field *bch2_sb_field_get_minsize_id(struct bch_sb_handle *,
52 enum bch_sb_field_type, unsigned);
53#define bch2_sb_field_get_minsize(_sb, _name, _u64s) \
54 field_to_type(bch2_sb_field_get_minsize_id(_sb, BCH_SB_FIELD_##_name, _u64s), _name)
55
56#define bch2_sb_field_nr_entries(_f) \
57 (_f ? ((bch2_sb_field_bytes(&_f->field) - sizeof(*_f)) / \
58 sizeof(_f->entries[0])) \
59 : 0)
60
61void bch2_sb_field_delete(struct bch_sb_handle *, enum bch_sb_field_type);
62
63extern const char * const bch2_sb_fields[];
64
65struct bch_sb_field_ops {
66 int (*validate)(struct bch_sb *, struct bch_sb_field *,
67 enum bch_validate_flags, struct printbuf *);
68 void (*to_text)(struct printbuf *, struct bch_sb *, struct bch_sb_field *);
69};
70
71static inline __le64 bch2_sb_magic(struct bch_fs *c)
72{
73 __le64 ret;
74
75 memcpy(&ret, &c->sb.uuid, sizeof(ret));
76 return ret;
77}
78
79static inline __u64 jset_magic(struct bch_fs *c)
80{
81 return __le64_to_cpu(bch2_sb_magic(c) ^ JSET_MAGIC);
82}
83
84static inline __u64 bset_magic(struct bch_fs *c)
85{
86 return __le64_to_cpu(bch2_sb_magic(c) ^ BSET_MAGIC);
87}
88
89int bch2_sb_to_fs(struct bch_fs *, struct bch_sb *);
90int bch2_sb_from_fs(struct bch_fs *, struct bch_dev *);
91
92void bch2_free_super(struct bch_sb_handle *);
93int bch2_sb_realloc(struct bch_sb_handle *, unsigned);
94
95int bch2_read_super(const char *, struct bch_opts *, struct bch_sb_handle *);
96int bch2_read_super_silent(const char *, struct bch_opts *, struct bch_sb_handle *);
97int bch2_write_super(struct bch_fs *);
98void __bch2_check_set_feature(struct bch_fs *, unsigned);
99
100static inline void bch2_check_set_feature(struct bch_fs *c, unsigned feat)
101{
102 if (!(c->sb.features & (1ULL << feat)))
103 __bch2_check_set_feature(c, feat);
104}
105
106bool bch2_check_version_downgrade(struct bch_fs *);
107void bch2_sb_upgrade(struct bch_fs *, unsigned, bool);
108
109void __bch2_sb_field_to_text(struct printbuf *, struct bch_sb *,
110 struct bch_sb_field *);
111void bch2_sb_field_to_text(struct printbuf *, struct bch_sb *,
112 struct bch_sb_field *);
113void bch2_sb_layout_to_text(struct printbuf *, struct bch_sb_layout *);
114void bch2_sb_to_text(struct printbuf *, struct bch_sb *, bool, unsigned);
115
116#endif /* _BCACHEFS_SUPER_IO_H */