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Diffstat (limited to 'libbcachefs/subvolume.c')
-rw-r--r--libbcachefs/subvolume.c83
1 files changed, 53 insertions, 30 deletions
diff --git a/libbcachefs/subvolume.c b/libbcachefs/subvolume.c
index c15b4781..811a6f42 100644
--- a/libbcachefs/subvolume.c
+++ b/libbcachefs/subvolume.c
@@ -25,20 +25,25 @@ static inline u32 get_ancestor_below(struct snapshot_table *t, u32 id, u32 ances
return s->parent;
}
-bool bch2_snapshot_is_ancestor(struct bch_fs *c, u32 id, u32 ancestor)
+bool __bch2_snapshot_is_ancestor(struct bch_fs *c, u32 id, u32 ancestor)
{
struct snapshot_table *t;
+ bool ret;
EBUG_ON(c->curr_recovery_pass <= BCH_RECOVERY_PASS_check_snapshots);
rcu_read_lock();
t = rcu_dereference(c->snapshots);
- while (id && id < ancestor)
+ while (id && id < ancestor - IS_ANCESTOR_BITMAP)
id = get_ancestor_below(t, id, ancestor);
+
+ ret = id && id < ancestor
+ ? test_bit(ancestor - id - 1, __snapshot_t(t, id)->is_ancestor)
+ : id == ancestor;
rcu_read_unlock();
- return id == ancestor;
+ return ret;
}
static bool bch2_snapshot_is_ancestor_early(struct bch_fs *c, u32 id, u32 ancestor)
@@ -189,6 +194,13 @@ void bch2_snapshot_to_text(struct printbuf *out, struct bch_fs *c,
le32_to_cpu(s.v->children[1]),
le32_to_cpu(s.v->subvol),
le32_to_cpu(s.v->tree));
+
+ if (bkey_val_bytes(k.k) > offsetof(struct bch_snapshot, depth))
+ prt_printf(out, " depth %u skiplist %u %u %u",
+ le32_to_cpu(s.v->depth),
+ le32_to_cpu(s.v->skip[0]),
+ le32_to_cpu(s.v->skip[1]),
+ le32_to_cpu(s.v->skip[2]));
}
int bch2_snapshot_invalid(const struct bch_fs *c, struct bkey_s_c k,
@@ -263,11 +275,12 @@ int bch2_mark_snapshot(struct btree_trans *trans,
{
struct bch_fs *c = trans->c;
struct snapshot_t *t;
+ u32 id = new.k->p.offset;
int ret = 0;
mutex_lock(&c->snapshot_table_lock);
- t = snapshot_t_mut(c, new.k->p.offset);
+ t = snapshot_t_mut(c, id);
if (!t) {
ret = -BCH_ERR_ENOMEM_mark_snapshot;
goto err;
@@ -275,25 +288,36 @@ int bch2_mark_snapshot(struct btree_trans *trans,
if (new.k->type == KEY_TYPE_snapshot) {
struct bkey_s_c_snapshot s = bkey_s_c_to_snapshot(new);
+ u32 parent = id;
t->parent = le32_to_cpu(s.v->parent);
- t->skip[0] = le32_to_cpu(s.v->skip[0]);
- t->skip[1] = le32_to_cpu(s.v->skip[1]);
- t->skip[2] = le32_to_cpu(s.v->skip[2]);
- t->depth = le32_to_cpu(s.v->depth);
t->children[0] = le32_to_cpu(s.v->children[0]);
t->children[1] = le32_to_cpu(s.v->children[1]);
t->subvol = BCH_SNAPSHOT_SUBVOL(s.v) ? le32_to_cpu(s.v->subvol) : 0;
t->tree = le32_to_cpu(s.v->tree);
- if (BCH_SNAPSHOT_DELETED(s.v))
+ if (bkey_val_bytes(s.k) > offsetof(struct bch_snapshot, depth)) {
+ t->depth = le32_to_cpu(s.v->depth);
+ t->skip[0] = le32_to_cpu(s.v->skip[0]);
+ t->skip[1] = le32_to_cpu(s.v->skip[1]);
+ t->skip[2] = le32_to_cpu(s.v->skip[2]);
+ } else {
+ t->depth = 0;
+ t->skip[0] = 0;
+ t->skip[1] = 0;
+ t->skip[2] = 0;
+ }
+
+ while ((parent = bch2_snapshot_parent_early(c, parent)) &&
+ parent - id - 1 < IS_ANCESTOR_BITMAP)
+ __set_bit(parent - id - 1, t->is_ancestor);
+
+ if (BCH_SNAPSHOT_DELETED(s.v)) {
set_bit(BCH_FS_HAVE_DELETED_SNAPSHOTS, &c->flags);
+ c->recovery_passes_explicit |= BIT_ULL(BCH_RECOVERY_PASS_delete_dead_snapshots);
+ }
} else {
- t->parent = 0;
- t->children[0] = 0;
- t->children[1] = 0;
- t->subvol = 0;
- t->tree = 0;
+ memset(t, 0, sizeof(*t));
}
err:
mutex_unlock(&c->snapshot_table_lock);
@@ -573,7 +597,7 @@ static int snapshot_tree_ptr_good(struct btree_trans *trans,
return bch2_snapshot_is_ancestor_early(trans->c, snap_id, le32_to_cpu(s_t.root_snapshot));
}
-static u32 snapshot_rand_ancestor_get(struct bch_fs *c, u32 id)
+static u32 snapshot_skiplist_get(struct bch_fs *c, u32 id)
{
const struct snapshot_t *s;
@@ -589,8 +613,7 @@ static u32 snapshot_rand_ancestor_get(struct bch_fs *c, u32 id)
return id;
}
-static int snapshot_rand_ancestor_good(struct btree_trans *trans,
- struct bch_snapshot s)
+static int snapshot_skiplist_good(struct btree_trans *trans, struct bch_snapshot s)
{
struct bch_snapshot a;
unsigned i;
@@ -778,10 +801,10 @@ static int check_snapshot(struct btree_trans *trans,
real_depth = bch2_snapshot_depth(c, parent_id);
- if (fsck_err_on(le32_to_cpu(s.depth) != real_depth, c,
- "snapshot with incorrect depth fields, should be %u:\n %s",
- real_depth,
- (bch2_bkey_val_to_text(&buf, c, k), buf.buf))) {
+ if (le32_to_cpu(s.depth) != real_depth &&
+ (c->sb.version_upgrade_complete < bcachefs_metadata_version_snapshot_skiplists ||
+ fsck_err(c, "snapshot with incorrect depth field, should be %u:\n %s",
+ real_depth, (bch2_bkey_val_to_text(&buf, c, k), buf.buf)))) {
u = bch2_bkey_make_mut_typed(trans, iter, &k, 0, snapshot);
ret = PTR_ERR_OR_ZERO(u);
if (ret)
@@ -791,19 +814,21 @@ static int check_snapshot(struct btree_trans *trans,
s = u->v;
}
- ret = snapshot_rand_ancestor_good(trans, s);
+ ret = snapshot_skiplist_good(trans, s);
if (ret < 0)
goto err;
- if (fsck_err_on(!ret, c, "snapshot with bad rand_ancestor field:\n %s",
- (bch2_bkey_val_to_text(&buf, c, k), buf.buf))) {
+ if (!ret &&
+ (c->sb.version_upgrade_complete < bcachefs_metadata_version_snapshot_skiplists ||
+ fsck_err(c, "snapshot with bad skiplist field:\n %s",
+ (bch2_bkey_val_to_text(&buf, c, k), buf.buf)))) {
u = bch2_bkey_make_mut_typed(trans, iter, &k, 0, snapshot);
ret = PTR_ERR_OR_ZERO(u);
if (ret)
goto err;
for (i = 0; i < ARRAY_SIZE(u->v.skip); i++)
- u->v.skip[i] = cpu_to_le32(snapshot_rand_ancestor_get(c, parent_id));
+ u->v.skip[i] = cpu_to_le32(snapshot_skiplist_get(c, parent_id));
bubble_sort(u->v.skip, ARRAY_SIZE(u->v.skip), cmp_int);
s = u->v;
@@ -1096,7 +1121,7 @@ static int create_snapids(struct btree_trans *trans, u32 parent, u32 tree,
n->v.depth = cpu_to_le32(depth);
for (j = 0; j < ARRAY_SIZE(n->v.skip); j++)
- n->v.skip[j] = cpu_to_le32(snapshot_rand_ancestor_get(c, parent));
+ n->v.skip[j] = cpu_to_le32(snapshot_skiplist_get(c, parent));
bubble_sort(n->v.skip, ARRAY_SIZE(n->v.skip), cmp_int);
SET_BCH_SNAPSHOT_SUBVOL(&n->v, true);
@@ -1255,9 +1280,6 @@ int bch2_delete_dead_snapshots(struct bch_fs *c)
u32 i, id;
int ret = 0;
- if (!test_bit(BCH_FS_HAVE_DELETED_SNAPSHOTS, &c->flags))
- return 0;
-
if (!test_bit(BCH_FS_STARTED, &c->flags)) {
ret = bch2_fs_read_write_early(c);
if (ret) {
@@ -1352,7 +1374,8 @@ static void bch2_delete_dead_snapshots_work(struct work_struct *work)
{
struct bch_fs *c = container_of(work, struct bch_fs, snapshot_delete_work);
- bch2_delete_dead_snapshots(c);
+ if (test_bit(BCH_FS_HAVE_DELETED_SNAPSHOTS, &c->flags))
+ bch2_delete_dead_snapshots(c);
bch2_write_ref_put(c, BCH_WRITE_REF_delete_dead_snapshots);
}
generated by cgit v1.2.3 (git 2.46.0) at 2025-07-01 08:33:53 +0000