265 lines
6.2 KiB
C
265 lines
6.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHEFS_SNAPSHOT_H
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#define _BCACHEFS_SNAPSHOT_H
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enum bkey_invalid_flags;
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void bch2_snapshot_tree_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
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int bch2_snapshot_tree_invalid(struct bch_fs *, struct bkey_s_c,
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enum bkey_invalid_flags, struct printbuf *);
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#define bch2_bkey_ops_snapshot_tree ((struct bkey_ops) { \
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.key_invalid = bch2_snapshot_tree_invalid, \
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.val_to_text = bch2_snapshot_tree_to_text, \
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.min_val_size = 8, \
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})
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struct bkey_i_snapshot_tree *__bch2_snapshot_tree_create(struct btree_trans *);
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int bch2_snapshot_tree_lookup(struct btree_trans *, u32, struct bch_snapshot_tree *);
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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(struct bch_fs *, struct bkey_s_c,
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enum bkey_invalid_flags, struct printbuf *);
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int bch2_mark_snapshot(struct btree_trans *, enum btree_id, unsigned,
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struct bkey_s_c, struct bkey_s, unsigned);
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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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.trigger = bch2_mark_snapshot, \
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.min_val_size = 24, \
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})
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static inline struct snapshot_t *__snapshot_t(struct snapshot_table *t, u32 id)
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{
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return &t->s[U32_MAX - id];
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}
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static inline const struct snapshot_t *snapshot_t(struct bch_fs *c, u32 id)
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{
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return __snapshot_t(rcu_dereference(c->snapshots), id);
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}
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static inline u32 bch2_snapshot_tree(struct bch_fs *c, u32 id)
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{
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rcu_read_lock();
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id = snapshot_t(c, id)->tree;
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rcu_read_unlock();
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return id;
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}
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static inline u32 __bch2_snapshot_parent_early(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_parent_early(struct bch_fs *c, u32 id)
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{
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rcu_read_lock();
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id = __bch2_snapshot_parent_early(c, id);
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rcu_read_unlock();
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return 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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#ifdef CONFIG_BCACHEFS_DEBUG
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u32 parent = snapshot_t(c, id)->parent;
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if (parent &&
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snapshot_t(c, id)->depth != snapshot_t(c, parent)->depth + 1)
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panic("id %u depth=%u parent %u depth=%u\n",
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id, snapshot_t(c, id)->depth,
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parent, snapshot_t(c, parent)->depth);
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return parent;
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#else
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return snapshot_t(c, id)->parent;
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#endif
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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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rcu_read_lock();
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id = __bch2_snapshot_parent(c, id);
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rcu_read_unlock();
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return id;
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}
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static inline u32 bch2_snapshot_nth_parent(struct bch_fs *c, u32 id, u32 n)
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{
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rcu_read_lock();
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while (n--)
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id = __bch2_snapshot_parent(c, id);
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rcu_read_unlock();
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return id;
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}
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u32 bch2_snapshot_skiplist_get(struct bch_fs *, u32);
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static inline u32 bch2_snapshot_root(struct bch_fs *c, u32 id)
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{
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u32 parent;
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rcu_read_lock();
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while ((parent = __bch2_snapshot_parent(c, id)))
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id = parent;
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rcu_read_unlock();
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return id;
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}
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static inline u32 __bch2_snapshot_equiv(struct bch_fs *c, u32 id)
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{
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return snapshot_t(c, id)->equiv;
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}
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static inline u32 bch2_snapshot_equiv(struct bch_fs *c, u32 id)
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{
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rcu_read_lock();
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id = __bch2_snapshot_equiv(c, id);
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rcu_read_unlock();
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return id;
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}
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static inline bool bch2_snapshot_is_equiv(struct bch_fs *c, u32 id)
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{
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return id == bch2_snapshot_equiv(c, id);
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}
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static inline bool bch2_snapshot_is_internal_node(struct bch_fs *c, u32 id)
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{
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const struct snapshot_t *s;
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bool ret;
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rcu_read_lock();
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s = snapshot_t(c, id);
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ret = s->children[0];
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rcu_read_unlock();
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return ret;
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}
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static inline u32 bch2_snapshot_is_leaf(struct bch_fs *c, u32 id)
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{
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return !bch2_snapshot_is_internal_node(c, id);
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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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const 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 u32 bch2_snapshot_depth(struct bch_fs *c, u32 parent)
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{
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u32 depth;
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rcu_read_lock();
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depth = parent ? snapshot_t(c, parent)->depth + 1 : 0;
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rcu_read_unlock();
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return depth;
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}
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bool __bch2_snapshot_is_ancestor(struct bch_fs *, u32, u32);
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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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return id == ancestor
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? true
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: __bch2_snapshot_is_ancestor(c, id, ancestor);
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}
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static inline bool bch2_snapshot_has_children(struct bch_fs *c, u32 id)
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{
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const struct snapshot_t *t;
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bool ret;
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rcu_read_lock();
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t = snapshot_t(c, id);
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ret = (t->children[0]|t->children[1]) != 0;
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rcu_read_unlock();
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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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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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static inline bool snapshot_list_has_ancestor(struct bch_fs *c, snapshot_id_list *s, u32 id)
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{
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darray_for_each(*s, i)
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if (bch2_snapshot_is_ancestor(c, id, *i))
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return true;
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return false;
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}
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static inline int snapshot_list_add(struct bch_fs *c, snapshot_id_list *s, u32 id)
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{
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int ret;
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BUG_ON(snapshot_list_has_id(s, id));
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ret = darray_push(s, id);
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if (ret)
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bch_err(c, "error reallocating snapshot_id_list (size %zu)", s->size);
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return ret;
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}
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int bch2_snapshot_lookup(struct btree_trans *trans, u32 id,
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struct bch_snapshot *s);
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int bch2_snapshot_get_subvol(struct btree_trans *, u32,
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struct bch_subvolume *);
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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_check_snapshot_trees(struct bch_fs *);
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int bch2_check_snapshots(struct bch_fs *);
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int bch2_snapshot_node_set_deleted(struct btree_trans *, u32);
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void bch2_delete_dead_snapshots_work(struct work_struct *);
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int __bch2_key_has_snapshot_overwrites(struct btree_trans *, enum btree_id, struct bpos);
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static inline int bch2_key_has_snapshot_overwrites(struct btree_trans *trans,
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enum btree_id id,
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struct bpos pos)
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{
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if (!btree_type_has_snapshots(id) ||
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bch2_snapshot_is_leaf(trans->c, pos.snapshot))
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return 0;
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return __bch2_key_has_snapshot_overwrites(trans, id, pos);
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}
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int bch2_propagate_key_to_snapshot_leaves(struct btree_trans *, enum btree_id,
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struct bkey_s_c, struct bpos *);
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int bch2_snapshots_read(struct bch_fs *);
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void bch2_fs_snapshots_exit(struct bch_fs *);
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#endif /* _BCACHEFS_SNAPSHOT_H */
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