bcachefs: Fix potential sleeping during mount

During mount, bcachefs mount option processing may sleep while allocating a string buffer.

Fix this by reference counting in order to take the atomic path.

Signed-off-by: Daniel J Blueman <daniel@quora.org>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

diff --git a/fs/bcachefs/disk_groups.c b/fs/bcachefs/disk_groups.c
index 1f334124055ba17ff66ba5d23f8fb59734f47e92..4d0cb0ccff32f2c75fa66f932f517f00b9cfdf25 100644 (file)
--- a/fs/bcachefs/disk_groups.c
+++ b/fs/bcachefs/disk_groups.c
@@ -555,6 +555,7 @@ void bch2_target_to_text(struct printbuf *out, struct bch_fs *c, unsigned v)
        case TARGET_DEV: {
                struct bch_dev *ca;
 
+               out->atomic++;
                rcu_read_lock();
                ca = t.dev < c->sb.nr_devices
                        ? rcu_dereference(c->devs[t.dev])
@@ -570,6 +571,7 @@ void bch2_target_to_text(struct printbuf *out, struct bch_fs *c, unsigned v)
                }
 
                rcu_read_unlock();
+               out->atomic--;
                break;
        }
        case TARGET_GROUP: