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125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_SUBVOLUME_H
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#define _BCACHEFS_SUBVOLUME_H
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#include "darray.h"
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#include "subvolume_types.h"
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void bch2_snapshot_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
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int bch2_snapshot_invalid(const struct bch_fs *, struct bkey_s_c, struct printbuf *);
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#define bch2_bkey_ops_snapshot (struct bkey_ops) { \
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.key_invalid = bch2_snapshot_invalid, \
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.val_to_text = bch2_snapshot_to_text, \
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}
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int bch2_mark_snapshot(struct btree_trans *, struct bkey_s_c,
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struct bkey_s_c, unsigned);
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static inline struct snapshot_t *snapshot_t(struct bch_fs *c, u32 id)
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{
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return genradix_ptr(&c->snapshots, U32_MAX - id);
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}
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static inline u32 bch2_snapshot_parent(struct bch_fs *c, u32 id)
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{
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return snapshot_t(c, id)->parent;
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}
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static inline u32 bch2_snapshot_internal_node(struct bch_fs *c, u32 id)
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{
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struct snapshot_t *s = snapshot_t(c, id);
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return s->children[0] || s->children[1];
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}
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static inline u32 bch2_snapshot_sibling(struct bch_fs *c, u32 id)
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{
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struct snapshot_t *s;
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u32 parent = bch2_snapshot_parent(c, id);
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if (!parent)
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return 0;
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s = snapshot_t(c, bch2_snapshot_parent(c, id));
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if (id == s->children[0])
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return s->children[1];
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if (id == s->children[1])
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return s->children[0];
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return 0;
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}
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static inline bool bch2_snapshot_is_ancestor(struct bch_fs *c, u32 id, u32 ancestor)
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{
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while (id && id < ancestor)
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id = bch2_snapshot_parent(c, id);
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return id == ancestor;
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}
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struct snapshots_seen {
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struct bpos pos;
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DARRAY(u32) ids;
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};
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static inline void snapshots_seen_exit(struct snapshots_seen *s)
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{
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kfree(s->ids.data);
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s->ids.data = NULL;
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}
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static inline void snapshots_seen_init(struct snapshots_seen *s)
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{
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memset(s, 0, sizeof(*s));
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}
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static inline int snapshots_seen_add(struct bch_fs *c, struct snapshots_seen *s, u32 id)
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{
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int ret = darray_push(&s->ids, id);
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if (ret)
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bch_err(c, "error reallocating snapshots_seen table (size %zu)",
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s->ids.size);
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return ret;
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}
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static inline bool snapshot_list_has_id(snapshot_id_list *s, u32 id)
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{
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u32 *i;
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darray_for_each(*s, i)
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if (*i == id)
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return true;
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return false;
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}
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int bch2_fs_snapshots_check(struct bch_fs *);
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void bch2_fs_snapshots_exit(struct bch_fs *);
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int bch2_fs_snapshots_start(struct bch_fs *);
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int bch2_subvolume_invalid(const struct bch_fs *, struct bkey_s_c, struct printbuf *);
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void bch2_subvolume_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
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#define bch2_bkey_ops_subvolume (struct bkey_ops) { \
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.key_invalid = bch2_subvolume_invalid, \
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.val_to_text = bch2_subvolume_to_text, \
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}
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int bch2_subvolume_get(struct btree_trans *, unsigned,
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bool, int, struct bch_subvolume *);
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int bch2_snapshot_get_subvol(struct btree_trans *, u32,
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struct bch_subvolume *);
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int bch2_subvolume_get_snapshot(struct btree_trans *, u32, u32 *);
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/* only exported for tests: */
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int bch2_snapshot_node_create(struct btree_trans *, u32,
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u32 *, u32 *, unsigned);
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int bch2_subvolume_delete(struct btree_trans *, u32);
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int bch2_subvolume_unlink(struct btree_trans *, u32);
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int bch2_subvolume_create(struct btree_trans *, u64, u32,
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u32 *, u32 *, bool);
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int bch2_fs_subvolumes_init(struct bch_fs *);
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#endif /* _BCACHEFS_SUBVOLUME_H */
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