#ifndef _BCACHEFS_SUBVOLUME_H
#define _BCACHEFS_SUBVOLUME_H
+#include "darray.h"
#include "subvolume_types.h"
+enum bkey_invalid_flags;
+
+void bch2_snapshot_tree_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
+int bch2_snapshot_tree_invalid(const struct bch_fs *, struct bkey_s_c,
+ enum bkey_invalid_flags, struct printbuf *);
+
+#define bch2_bkey_ops_snapshot_tree ((struct bkey_ops) { \
+ .key_invalid = bch2_snapshot_tree_invalid, \
+ .val_to_text = bch2_snapshot_tree_to_text, \
+ .min_val_size = 8, \
+})
+
+int bch2_snapshot_tree_lookup(struct btree_trans *, u32, struct bch_snapshot_tree *);
+
void bch2_snapshot_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
-const char *bch2_snapshot_invalid(const struct bch_fs *, struct bkey_s_c);
+int bch2_snapshot_invalid(const struct bch_fs *, struct bkey_s_c,
+ enum bkey_invalid_flags, struct printbuf *);
+int bch2_mark_snapshot(struct btree_trans *, enum btree_id, unsigned,
+ struct bkey_s_c, struct bkey_s_c, unsigned);
-#define bch2_bkey_ops_snapshot (struct bkey_ops) { \
+#define bch2_bkey_ops_snapshot ((struct bkey_ops) { \
.key_invalid = bch2_snapshot_invalid, \
.val_to_text = bch2_snapshot_to_text, \
+ .atomic_trigger = bch2_mark_snapshot, \
+ .min_val_size = 24, \
+})
+
+static inline struct snapshot_t *__snapshot_t(struct snapshot_table *t, u32 id)
+{
+ return &t->s[U32_MAX - id];
}
-int bch2_mark_snapshot(struct btree_trans *, struct bkey_s_c,
- struct bkey_s_c, unsigned);
+static inline const struct snapshot_t *snapshot_t(struct bch_fs *c, u32 id)
+{
+ return __snapshot_t(rcu_dereference(c->snapshots), id);
+}
-static inline struct snapshot_t *snapshot_t(struct bch_fs *c, u32 id)
+static inline u32 bch2_snapshot_tree(struct bch_fs *c, u32 id)
{
- return genradix_ptr(&c->snapshots, U32_MAX - id);
+ rcu_read_lock();
+ id = snapshot_t(c, id)->tree;
+ rcu_read_unlock();
+
+ return id;
}
-static inline u32 bch2_snapshot_parent(struct bch_fs *c, u32 id)
+static inline u32 __bch2_snapshot_parent_early(struct bch_fs *c, u32 id)
+{
+ return snapshot_t(c, id)->parent;
+}
+
+static inline u32 bch2_snapshot_parent_early(struct bch_fs *c, u32 id)
+{
+ rcu_read_lock();
+ id = __bch2_snapshot_parent_early(c, id);
+ rcu_read_unlock();
+
+ return id;
+}
+
+static inline u32 __bch2_snapshot_parent(struct bch_fs *c, u32 id)
{
+#ifdef CONFIG_BCACHEFS_DEBUG
+ u32 parent = snapshot_t(c, id)->parent;
+
+ if (parent &&
+ snapshot_t(c, id)->depth != snapshot_t(c, parent)->depth + 1)
+ panic("id %u depth=%u parent %u depth=%u\n",
+ id, snapshot_t(c, id)->depth,
+ parent, snapshot_t(c, parent)->depth);
+
+ return parent;
+#else
return snapshot_t(c, id)->parent;
+#endif
}
-static inline u32 bch2_snapshot_internal_node(struct bch_fs *c, u32 id)
+static inline u32 bch2_snapshot_parent(struct bch_fs *c, u32 id)
{
- struct snapshot_t *s = snapshot_t(c, id);
+ rcu_read_lock();
+ id = __bch2_snapshot_parent(c, id);
+ rcu_read_unlock();
- return s->children[0] || s->children[1];
+ return id;
+}
+
+static inline u32 bch2_snapshot_nth_parent(struct bch_fs *c, u32 id, u32 n)
+{
+ rcu_read_lock();
+ while (n--)
+ id = __bch2_snapshot_parent(c, id);
+ rcu_read_unlock();
+
+ return id;
+}
+
+static inline u32 bch2_snapshot_root(struct bch_fs *c, u32 id)
+{
+ u32 parent;
+
+ rcu_read_lock();
+ while ((parent = __bch2_snapshot_parent(c, id)))
+ id = parent;
+ rcu_read_unlock();
+
+ return id;
+}
+
+static inline u32 __bch2_snapshot_equiv(struct bch_fs *c, u32 id)
+{
+ return snapshot_t(c, id)->equiv;
+}
+
+static inline u32 bch2_snapshot_equiv(struct bch_fs *c, u32 id)
+{
+ rcu_read_lock();
+ id = __bch2_snapshot_equiv(c, id);
+ rcu_read_unlock();
+
+ return id;
+}
+
+static inline bool bch2_snapshot_is_equiv(struct bch_fs *c, u32 id)
+{
+ return id == bch2_snapshot_equiv(c, id);
+}
+
+static inline bool bch2_snapshot_is_internal_node(struct bch_fs *c, u32 id)
+{
+ const struct snapshot_t *s;
+ bool ret;
+
+ rcu_read_lock();
+ s = snapshot_t(c, id);
+ ret = s->children[0];
+ rcu_read_unlock();
+
+ return ret;
+}
+
+static inline u32 bch2_snapshot_is_leaf(struct bch_fs *c, u32 id)
+{
+ return !bch2_snapshot_is_internal_node(c, id);
}
static inline u32 bch2_snapshot_sibling(struct bch_fs *c, u32 id)
{
- struct snapshot_t *s;
- u32 parent = bch2_snapshot_parent(c, id);
+ const struct snapshot_t *s;
+ u32 parent = __bch2_snapshot_parent(c, id);
if (!parent)
return 0;
- s = snapshot_t(c, bch2_snapshot_parent(c, id));
+ s = snapshot_t(c, __bch2_snapshot_parent(c, id));
if (id == s->children[0])
return s->children[1];
if (id == s->children[1])
return 0;
}
+bool __bch2_snapshot_is_ancestor(struct bch_fs *, u32, u32);
+
static inline bool bch2_snapshot_is_ancestor(struct bch_fs *c, u32 id, u32 ancestor)
{
- while (id && id < ancestor)
- id = bch2_snapshot_parent(c, id);
-
- return id == ancestor;
+ return id == ancestor
+ ? true
+ : __bch2_snapshot_is_ancestor(c, id, ancestor);
}
-struct snapshots_seen {
- struct bpos pos;
- size_t nr;
- size_t size;
- u32 *d;
-};
-
-static inline void snapshots_seen_exit(struct snapshots_seen *s)
+static inline bool bch2_snapshot_has_children(struct bch_fs *c, u32 id)
{
- kfree(s->d);
- s->d = NULL;
-}
+ const struct snapshot_t *t;
+ bool ret;
-static inline void snapshots_seen_init(struct snapshots_seen *s)
-{
- memset(s, 0, sizeof(*s));
+ rcu_read_lock();
+ t = snapshot_t(c, id);
+ ret = (t->children[0]|t->children[1]) != 0;
+ rcu_read_unlock();
+
+ return ret;
}
-static inline int snapshots_seen_add(struct bch_fs *c, struct snapshots_seen *s, u32 id)
+static inline bool snapshot_list_has_id(snapshot_id_list *s, u32 id)
{
- if (s->nr == s->size) {
- size_t new_size = max(s->size, (size_t) 128) * 2;
- u32 *d = krealloc(s->d, new_size * sizeof(s->d[0]), GFP_KERNEL);
-
- if (!d) {
- bch_err(c, "error reallocating snapshots_seen table (new size %zu)",
- new_size);
- return -ENOMEM;
- }
+ u32 *i;
- s->size = new_size;
- s->d = d;
- }
-
- s->d[s->nr++] = id;
- return 0;
+ darray_for_each(*s, i)
+ if (*i == id)
+ return true;
+ return false;
}
-static inline bool snapshot_list_has_id(struct snapshot_id_list *s, u32 id)
+static inline bool snapshot_list_has_ancestor(struct bch_fs *c, snapshot_id_list *s, u32 id)
{
- unsigned i;
+ u32 *i;
- for (i = 0; i < s->nr; i++)
- if (id == s->d[i])
+ darray_for_each(*s, i)
+ if (bch2_snapshot_is_ancestor(c, id, *i))
return true;
return false;
}
-int bch2_fs_snapshots_check(struct bch_fs *);
+static inline int snapshot_list_add(struct bch_fs *c, snapshot_id_list *s, u32 id)
+{
+ int ret;
+
+ BUG_ON(snapshot_list_has_id(s, id));
+ ret = darray_push(s, id);
+ if (ret)
+ bch_err(c, "error reallocating snapshot_id_list (size %zu)", s->size);
+ return ret;
+}
+
+int bch2_check_snapshot_trees(struct bch_fs *);
+int bch2_check_snapshots(struct bch_fs *);
+int bch2_check_subvols(struct bch_fs *);
+
void bch2_fs_snapshots_exit(struct bch_fs *);
-int bch2_fs_snapshots_start(struct bch_fs *);
+int bch2_snapshots_read(struct bch_fs *);
-const char *bch2_subvolume_invalid(const struct bch_fs *, struct bkey_s_c);
+int bch2_subvolume_invalid(const struct bch_fs *, struct bkey_s_c,
+ unsigned, struct printbuf *);
void bch2_subvolume_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
-#define bch2_bkey_ops_subvolume (struct bkey_ops) { \
+#define bch2_bkey_ops_subvolume ((struct bkey_ops) { \
.key_invalid = bch2_subvolume_invalid, \
.val_to_text = bch2_subvolume_to_text, \
-}
+ .min_val_size = 16, \
+})
int bch2_subvolume_get(struct btree_trans *, unsigned,
bool, int, struct bch_subvolume *);
+int bch2_snapshot_get_subvol(struct btree_trans *, u32,
+ struct bch_subvolume *);
int bch2_subvolume_get_snapshot(struct btree_trans *, u32, u32 *);
-int bch2_subvolume_delete(struct btree_trans *, u32);
+/* only exported for tests: */
+int bch2_snapshot_node_create(struct btree_trans *, u32,
+ u32 *, u32 *, unsigned);
+
+int bch2_delete_dead_snapshots(struct bch_fs *);
+void bch2_delete_dead_snapshots_async(struct bch_fs *);
+
int bch2_subvolume_unlink(struct btree_trans *, u32);
int bch2_subvolume_create(struct btree_trans *, u64, u32,
u32 *, u32 *, bool);
projects / bcachefs-tools-debian / blobdiff