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path: root/fs/bcachefs/snapshot.c
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Diffstat (limited to 'fs/bcachefs/snapshot.c')
-rw-r--r--fs/bcachefs/snapshot.c32
1 files changed, 18 insertions, 14 deletions
diff --git a/fs/bcachefs/snapshot.c b/fs/bcachefs/snapshot.c
index ac6ba04d5521..39debe814bf3 100644
--- a/fs/bcachefs/snapshot.c
+++ b/fs/bcachefs/snapshot.c
@@ -91,18 +91,20 @@ static int bch2_snapshot_tree_create(struct btree_trans *trans,
/* Snapshot nodes: */
-static bool bch2_snapshot_is_ancestor_early(struct bch_fs *c, u32 id, u32 ancestor)
+static bool __bch2_snapshot_is_ancestor_early(struct snapshot_table *t, u32 id, u32 ancestor)
{
- struct snapshot_table *t;
-
- rcu_read_lock();
- t = rcu_dereference(c->snapshots);
-
while (id && id < ancestor)
id = __snapshot_t(t, id)->parent;
+ return id == ancestor;
+}
+
+static bool bch2_snapshot_is_ancestor_early(struct bch_fs *c, u32 id, u32 ancestor)
+{
+ rcu_read_lock();
+ bool ret = __bch2_snapshot_is_ancestor_early(rcu_dereference(c->snapshots), id, ancestor);
rcu_read_unlock();
- return id == ancestor;
+ return ret;
}
static inline u32 get_ancestor_below(struct snapshot_table *t, u32 id, u32 ancestor)
@@ -120,13 +122,15 @@ static inline u32 get_ancestor_below(struct snapshot_table *t, u32 id, u32 ances
bool __bch2_snapshot_is_ancestor(struct bch_fs *c, u32 id, u32 ancestor)
{
- struct snapshot_table *t;
bool ret;
- EBUG_ON(c->recovery_pass_done <= BCH_RECOVERY_PASS_check_snapshots);
-
rcu_read_lock();
- t = rcu_dereference(c->snapshots);
+ struct snapshot_table *t = rcu_dereference(c->snapshots);
+
+ if (unlikely(c->recovery_pass_done <= BCH_RECOVERY_PASS_check_snapshots)) {
+ ret = __bch2_snapshot_is_ancestor_early(t, id, ancestor);
+ goto out;
+ }
while (id && id < ancestor - IS_ANCESTOR_BITMAP)
id = get_ancestor_below(t, id, ancestor);
@@ -134,11 +138,11 @@ bool __bch2_snapshot_is_ancestor(struct bch_fs *c, u32 id, u32 ancestor)
if (id && id < ancestor) {
ret = test_bit(ancestor - id - 1, __snapshot_t(t, id)->is_ancestor);
- EBUG_ON(ret != bch2_snapshot_is_ancestor_early(c, id, ancestor));
+ EBUG_ON(ret != __bch2_snapshot_is_ancestor_early(t, id, ancestor));
} else {
ret = id == ancestor;
}
-
+out:
rcu_read_unlock();
return ret;
@@ -547,7 +551,7 @@ static int check_snapshot_tree(struct btree_trans *trans,
"snapshot tree points to missing subvolume:\n %s",
(printbuf_reset(&buf),
bch2_bkey_val_to_text(&buf, c, st.s_c), buf.buf)) ||
- fsck_err_on(!bch2_snapshot_is_ancestor_early(c,
+ fsck_err_on(!bch2_snapshot_is_ancestor(c,
le32_to_cpu(subvol.snapshot),
root_id),
c, snapshot_tree_to_wrong_subvol,