bcachefs: Fix setquota

We were returning -EINTR because we were failing to retry the btree
transaction.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/quota.c

@@ -710,25 +710,15 @@ static int bch2_get_next_quota(struct super_block *sb, struct kqid *kqid,
 	return ret;
 }
 
-static int bch2_set_quota(struct super_block *sb, struct kqid qid,
+static int bch2_set_quota_trans(struct btree_trans *trans,
+				struct bkey_i_quota *new_quota,
 				struct qc_dqblk *qdq)
 {
-	struct bch_fs *c = sb->s_fs_info;
-	struct btree_trans trans;
 	struct btree_iter *iter;
 	struct bkey_s_c k;
-	struct bkey_i_quota new_quota;
 	int ret;
 
-	if (sb->s_flags & SB_RDONLY)
-		return -EROFS;
-
-	bkey_quota_init(&new_quota.k_i);
-	new_quota.k.p = POS(qid.type, from_kqid(&init_user_ns, qid));
-
-	bch2_trans_init(&trans, c, 0, 0);
-
-	iter = bch2_trans_get_iter(&trans, BTREE_ID_QUOTAS, new_quota.k.p,
+	iter = bch2_trans_get_iter(trans, BTREE_ID_QUOTAS, new_quota->k.p,
 				   BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
 	k = bch2_btree_iter_peek_slot(iter);
 
@@ -736,32 +726,43 @@ static int bch2_set_quota(struct super_block *sb, struct kqid qid,
 	if (unlikely(ret))
 		return ret;
 
-	switch (k.k->type) {
-	case KEY_TYPE_quota:
-		new_quota.v = *bkey_s_c_to_quota(k).v;
-		break;
-	}
+	if (k.k->type == KEY_TYPE_quota)
+		new_quota->v = *bkey_s_c_to_quota(k).v;
 
 	if (qdq->d_fieldmask & QC_SPC_SOFT)
-		new_quota.v.c[Q_SPC].softlimit = cpu_to_le64(qdq->d_spc_softlimit >> 9);
+		new_quota->v.c[Q_SPC].softlimit = cpu_to_le64(qdq->d_spc_softlimit >> 9);
 	if (qdq->d_fieldmask & QC_SPC_HARD)
-		new_quota.v.c[Q_SPC].hardlimit = cpu_to_le64(qdq->d_spc_hardlimit >> 9);
+		new_quota->v.c[Q_SPC].hardlimit = cpu_to_le64(qdq->d_spc_hardlimit >> 9);
 
 	if (qdq->d_fieldmask & QC_INO_SOFT)
-		new_quota.v.c[Q_INO].softlimit = cpu_to_le64(qdq->d_ino_softlimit);
+		new_quota->v.c[Q_INO].softlimit = cpu_to_le64(qdq->d_ino_softlimit);
 	if (qdq->d_fieldmask & QC_INO_HARD)
-		new_quota.v.c[Q_INO].hardlimit = cpu_to_le64(qdq->d_ino_hardlimit);
+		new_quota->v.c[Q_INO].hardlimit = cpu_to_le64(qdq->d_ino_hardlimit);
 
-	bch2_trans_update(&trans, iter, &new_quota.k_i, 0);
+	return bch2_trans_update(trans, iter, &new_quota->k_i, 0);
+}
 
-	ret = bch2_trans_commit(&trans, NULL, NULL, 0);
+static int bch2_set_quota(struct super_block *sb, struct kqid qid,
+			  struct qc_dqblk *qdq)
+{
+	struct bch_fs *c = sb->s_fs_info;
+	struct btree_trans trans;
+	struct bkey_i_quota new_quota;
+	int ret;
 
-	bch2_trans_exit(&trans);
+	if (sb->s_flags & SB_RDONLY)
+		return -EROFS;
 
-	if (ret)
-		return ret;
+	bkey_quota_init(&new_quota.k_i);
+	new_quota.k.p = POS(qid.type, from_kqid(&init_user_ns, qid));
 
-	ret = __bch2_quota_set(c, bkey_i_to_s_c(&new_quota.k_i));
+	bch2_trans_init(&trans, c, 0, 0);
+
+	ret = bch2_trans_do(c, NULL, NULL, BTREE_INSERT_NOUNLOCK,
+			    bch2_set_quota_trans(&trans, &new_quota, qdq)) ?:
+		__bch2_quota_set(c, bkey_i_to_s_c(&new_quota.k_i));
+
+	bch2_trans_exit(&trans);
 
 	return ret;
 }