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Linux kernel mirror (for testing)
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kernel
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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
24void 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 if (unlikely(version > c->sb.version_incompat)) {
30 if (version > c->sb.version_incompat_allowed)
31 return false;
32 bch2_set_version_incompat(c, version);
33 }
34 return true;
35}
36
37static inline size_t bch2_sb_field_bytes(struct bch_sb_field *f)
38{
39 return le32_to_cpu(f->u64s) * sizeof(u64);
40}
41
42#define field_to_type(_f, _name) \
43 container_of_or_null(_f, struct bch_sb_field_##_name, field)
44
45struct bch_sb_field *bch2_sb_field_get_id(struct bch_sb *, enum bch_sb_field_type);
46#define bch2_sb_field_get(_sb, _name) \
47 field_to_type(bch2_sb_field_get_id(_sb, BCH_SB_FIELD_##_name), _name)
48
49struct bch_sb_field *bch2_sb_field_resize_id(struct bch_sb_handle *,
50 enum bch_sb_field_type, unsigned);
51#define bch2_sb_field_resize(_sb, _name, _u64s) \
52 field_to_type(bch2_sb_field_resize_id(_sb, BCH_SB_FIELD_##_name, _u64s), _name)
53
54struct bch_sb_field *bch2_sb_field_get_minsize_id(struct bch_sb_handle *,
55 enum bch_sb_field_type, unsigned);
56#define bch2_sb_field_get_minsize(_sb, _name, _u64s) \
57 field_to_type(bch2_sb_field_get_minsize_id(_sb, BCH_SB_FIELD_##_name, _u64s), _name)
58
59#define bch2_sb_field_nr_entries(_f) \
60 (_f ? ((bch2_sb_field_bytes(&_f->field) - sizeof(*_f)) / \
61 sizeof(_f->entries[0])) \
62 : 0)
63
64void bch2_sb_field_delete(struct bch_sb_handle *, enum bch_sb_field_type);
65
66extern const char * const bch2_sb_fields[];
67
68struct bch_sb_field_ops {
69 int (*validate)(struct bch_sb *, struct bch_sb_field *,
70 enum bch_validate_flags, struct printbuf *);
71 void (*to_text)(struct printbuf *, struct bch_sb *, struct bch_sb_field *);
72};
73
74static inline __le64 bch2_sb_magic(struct bch_fs *c)
75{
76 __le64 ret;
77
78 memcpy(&ret, &c->sb.uuid, sizeof(ret));
79 return ret;
80}
81
82static inline __u64 jset_magic(struct bch_fs *c)
83{
84 return __le64_to_cpu(bch2_sb_magic(c) ^ JSET_MAGIC);
85}
86
87static inline __u64 bset_magic(struct bch_fs *c)
88{
89 return __le64_to_cpu(bch2_sb_magic(c) ^ BSET_MAGIC);
90}
91
92int bch2_sb_to_fs(struct bch_fs *, struct bch_sb *);
93int bch2_sb_from_fs(struct bch_fs *, struct bch_dev *);
94
95void bch2_free_super(struct bch_sb_handle *);
96int bch2_sb_realloc(struct bch_sb_handle *, unsigned);
97
98int bch2_read_super(const char *, struct bch_opts *, struct bch_sb_handle *);
99int bch2_read_super_silent(const char *, struct bch_opts *, struct bch_sb_handle *);
100int bch2_write_super(struct bch_fs *);
101void __bch2_check_set_feature(struct bch_fs *, unsigned);
102
103static inline void bch2_check_set_feature(struct bch_fs *c, unsigned feat)
104{
105 if (!(c->sb.features & (1ULL << feat)))
106 __bch2_check_set_feature(c, feat);
107}
108
109bool bch2_check_version_downgrade(struct bch_fs *);
110void bch2_sb_upgrade(struct bch_fs *, unsigned, bool);
111
112void __bch2_sb_field_to_text(struct printbuf *, struct bch_sb *,
113 struct bch_sb_field *);
114void bch2_sb_field_to_text(struct printbuf *, struct bch_sb *,
115 struct bch_sb_field *);
116void bch2_sb_layout_to_text(struct printbuf *, struct bch_sb_layout *);
117void bch2_sb_to_text(struct printbuf *, struct bch_sb *, bool, unsigned);
118
119#endif /* _BCACHEFS_SUPER_IO_H */