1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _BCACHEFS_SUBVOLUME_H
3 #define _BCACHEFS_SUBVOLUME_H
5 void bch2_snapshot_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
6 const char *bch2_snapshot_invalid(const struct bch_fs *, struct bkey_s_c);
8 #define bch2_bkey_ops_snapshot (struct bkey_ops) { \
9 .key_invalid = bch2_snapshot_invalid, \
10 .val_to_text = bch2_snapshot_to_text, \
13 int bch2_mark_snapshot(struct bch_fs *, struct bkey_s_c,
14 struct bkey_s_c, u64, unsigned);
16 static inline struct snapshot_t *snapshot_t(struct bch_fs *c, u32 id)
18 return genradix_ptr(&c->snapshots, U32_MAX - id);
21 static inline u32 bch2_snapshot_parent(struct bch_fs *c, u32 id)
23 return snapshot_t(c, id)->parent;
26 static inline u32 bch2_snapshot_internal_node(struct bch_fs *c, u32 id)
28 struct snapshot_t *s = snapshot_t(c, id);
30 return s->children[0] || s->children[1];
33 static inline u32 bch2_snapshot_sibling(struct bch_fs *c, u32 id)
36 u32 parent = bch2_snapshot_parent(c, id);
41 s = snapshot_t(c, bch2_snapshot_parent(c, id));
42 if (id == s->children[0])
43 return s->children[1];
44 if (id == s->children[1])
45 return s->children[0];
49 static inline bool bch2_snapshot_is_ancestor(struct bch_fs *c, u32 id, u32 ancestor)
51 while (id && id < ancestor)
52 id = bch2_snapshot_parent(c, id);
54 return id == ancestor;
57 struct snapshots_seen {
64 static inline void snapshots_seen_exit(struct snapshots_seen *s)
70 static inline void snapshots_seen_init(struct snapshots_seen *s)
72 memset(s, 0, sizeof(*s));
75 static inline int snapshots_seen_add(struct bch_fs *c, struct snapshots_seen *s, u32 id)
77 if (s->nr == s->size) {
78 size_t new_size = max(s->size, 128UL) * 2;
79 u32 *d = krealloc(s->d, new_size * sizeof(s->d[0]), GFP_KERNEL);
82 bch_err(c, "error reallocating snapshots_seen table (new size %zu)",
95 int bch2_fs_snapshots_check(struct bch_fs *);
96 void bch2_fs_snapshots_exit(struct bch_fs *);
97 int bch2_fs_snapshots_start(struct bch_fs *);
99 const char *bch2_subvolume_invalid(const struct bch_fs *, struct bkey_s_c);
100 void bch2_subvolume_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
102 #define bch2_bkey_ops_subvolume (struct bkey_ops) { \
103 .key_invalid = bch2_subvolume_invalid, \
104 .val_to_text = bch2_subvolume_to_text, \
107 int bch2_subvolume_get(struct btree_trans *, unsigned,
108 bool, int, struct bch_subvolume *);
109 int bch2_subvolume_get_snapshot(struct btree_trans *, u32, u32 *);
111 int bch2_subvolume_delete(struct btree_trans *, u32, int);
112 int bch2_subvolume_create(struct btree_trans *, u64, u32,
115 int bch2_fs_subvolumes_init(struct bch_fs *);
117 #endif /* _BCACHEFS_SUBVOLUME_H */