fs/nfs/nfs40client.c

Source file repositories/reference/linux-study-clean/fs/nfs/nfs40client.c

File Facts

System
Linux kernel
Corpus path
fs/nfs/nfs40client.c
Extension
.c
Size
6577 bytes
Lines
246
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

switch (status) {
		case -NFS4ERR_STALE_CLIENTID:
			break;
		case 0:
			nfs4_swap_callback_idents(pos, new);
			pos->cl_confirm = new->cl_confirm;
			nfs_mark_client_ready(pos, NFS_CS_READY);

			prev = NULL;
			*result = pos;
			goto out;
		case -ERESTARTSYS:
		case -ETIMEDOUT:
			/* The callback path may have been inadvertently
			 * changed. Schedule recovery!
			 */
			nfs4_schedule_path_down_recovery(pos);
			goto out;
		default:
			goto out;
		}

		spin_lock(&nn->nfs_client_lock);
	}
out_unlock:
	spin_unlock(&nn->nfs_client_lock);

	/* No match found. The server lost our clientid */
out:
	nfs_put_client(prev);
	return status;
}

/**
 * nfs40_discover_server_trunking - Detect server IP address trunking (mv0)
 *
 * @clp: nfs_client under test
 * @result: OUT: found nfs_client, or clp
 * @cred: credential to use for trunking test
 *
 * Returns zero, a negative errno, or a negative NFS4ERR status.
 * If zero is returned, an nfs_client pointer is planted in
 * "result".
 *
 * Note: The returned client may not yet be marked ready.
 */
int nfs40_discover_server_trunking(struct nfs_client *clp,
				   struct nfs_client **result,
				   const struct cred *cred)
{
	struct nfs4_setclientid_res clid = {
		.clientid = clp->cl_clientid,
		.confirm = clp->cl_confirm,
	};
	struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
	unsigned short port;
	int status;

	port = nn->nfs_callback_tcpport;
	if (clp->cl_addr.ss_family == AF_INET6)
		port = nn->nfs_callback_tcpport6;

	status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid);
	if (status != 0)
		goto out;
	clp->cl_clientid = clid.clientid;
	clp->cl_confirm = clid.confirm;

	status = nfs40_walk_client_list(clp, result, cred);
	if (status == 0) {
		/* Sustain the lease, even if it's empty.  If the clientid4
		 * goes stale it's of no use for trunking discovery. */
		nfs4_schedule_state_renewal(*result);

		/* If the client state need to recover, do it. */
		if (clp->cl_state)
			nfs4_schedule_state_manager(clp);
	}
out:
	return status;
}

Annotation

Implementation Notes