fs/smb/server/mgmt/tree_connect.c

Source file repositories/reference/linux-study-clean/fs/smb/server/mgmt/tree_connect.c

File Facts

System
Linux kernel
Corpus path
fs/smb/server/mgmt/tree_connect.c
Extension
.c
Size
4257 bytes
Lines
179
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

if (!new_sc) {
			pr_err("Failed to update stale share config\n");
			status.ret = -ESTALE;
			goto out_error;
		}
		ksmbd_share_config_put(sc);
		sc = new_sc;
	}

	tree_conn->user = sess->user;
	tree_conn->share_conf = sc;
	tree_conn->t_state = TREE_NEW;
	status.tree_conn = tree_conn;
	atomic_set(&tree_conn->refcount, 1);

	down_write(&sess->tree_conns_lock);
	ret = xa_err(xa_store(&sess->tree_conns, tree_conn->id, tree_conn,
			      KSMBD_DEFAULT_GFP));
	up_write(&sess->tree_conns_lock);
	if (ret) {
		status.ret = -ENOMEM;
		goto out_error;
	}
	ksmbd_counter_inc(KSMBD_COUNTER_TREE_CONNS);
	kvfree(resp);
	return status;

out_error:
	if (tree_conn)
		ksmbd_release_tree_conn_id(sess, tree_conn->id);
	ksmbd_share_config_put(sc);
	kfree(tree_conn);
	kvfree(resp);
	return status;
}

void ksmbd_tree_connect_put(struct ksmbd_tree_connect *tcon)
{
	if (atomic_dec_and_test(&tcon->refcount)) {
		ksmbd_share_config_put(tcon->share_conf);
		kfree(tcon);
	}
}

static int __ksmbd_tree_conn_disconnect(struct ksmbd_session *sess,
					struct ksmbd_tree_connect *tree_conn)
{
	int ret;

	ret = ksmbd_ipc_tree_disconnect_request(sess->id, tree_conn->id);
	ksmbd_release_tree_conn_id(sess, tree_conn->id);
	ksmbd_counter_dec(KSMBD_COUNTER_TREE_CONNS);
	if (atomic_dec_and_test(&tree_conn->refcount)) {
		ksmbd_share_config_put(tree_conn->share_conf);
		kfree(tree_conn);
	}
	return ret;
}

int ksmbd_tree_conn_disconnect(struct ksmbd_session *sess,
			       struct ksmbd_tree_connect *tree_conn)
{
	down_write(&sess->tree_conns_lock);
	xa_erase(&sess->tree_conns, tree_conn->id);
	up_write(&sess->tree_conns_lock);

	return __ksmbd_tree_conn_disconnect(sess, tree_conn);
}

struct ksmbd_tree_connect *ksmbd_tree_conn_lookup(struct ksmbd_session *sess,
						  unsigned int id)
{
	struct ksmbd_tree_connect *tcon;

	down_read(&sess->tree_conns_lock);
	tcon = xa_load(&sess->tree_conns, id);
	if (tcon) {
		if (tcon->t_state != TREE_CONNECTED)
			tcon = NULL;
		else if (!atomic_inc_not_zero(&tcon->refcount))
			tcon = NULL;
	}
	up_read(&sess->tree_conns_lock);

	return tcon;
}

int ksmbd_tree_conn_session_logoff(struct ksmbd_session *sess)
{
	int ret = 0;

Annotation

Implementation Notes