super.c

linux 内核源代码

	struct rpc_auth *auth = nfss->client->cl_auth;
	struct nfs_iostats totals = { };

	seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);

	/*
	 * Display all mount option settings
	 */
	seq_printf(m, "\n\topts:\t");
	seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
	seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
	seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
	seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
	nfs_show_mount_options(m, nfss, 1);

	seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);

	seq_printf(m, "\n\tcaps:\t");
	seq_printf(m, "caps=0x%x", nfss->caps);
	seq_printf(m, ",wtmult=%d", nfss->wtmult);
	seq_printf(m, ",dtsize=%d", nfss->dtsize);
	seq_printf(m, ",bsize=%d", nfss->bsize);
	seq_printf(m, ",namelen=%d", nfss->namelen);

#ifdef CONFIG_NFS_V4
	if (nfss->nfs_client->cl_nfsversion == 4) {
		seq_printf(m, "\n\tnfsv4:\t");
		seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
		seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
		seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
	}
#endif

	/*
	 * Display security flavor in effect for this mount
	 */
	seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor);
	if (auth->au_flavor)
		seq_printf(m, ",pseudoflavor=%d", auth->au_flavor);

	/*
	 * Display superblock I/O counters
	 */
	for_each_possible_cpu(cpu) {
		struct nfs_iostats *stats;

		preempt_disable();
		stats = per_cpu_ptr(nfss->io_stats, cpu);

		for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
			totals.events[i] += stats->events[i];
		for (i = 0; i < __NFSIOS_BYTESMAX; i++)
			totals.bytes[i] += stats->bytes[i];

		preempt_enable();
	}

	seq_printf(m, "\n\tevents:\t");
	for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
		seq_printf(m, "%lu ", totals.events[i]);
	seq_printf(m, "\n\tbytes:\t");
	for (i = 0; i < __NFSIOS_BYTESMAX; i++)
		seq_printf(m, "%Lu ", totals.bytes[i]);
	seq_printf(m, "\n");

	rpc_print_iostats(m, nfss->client);

	return 0;
}

/*
 * Begin unmount by attempting to remove all automounted mountpoints we added
 * in response to xdev traversals and referrals
 */
static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
{
	struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb);
	struct rpc_clnt *rpc;

	shrink_submounts(vfsmnt, &nfs_automount_list);

	if (!(flags & MNT_FORCE))
		return;
	/* -EIO all pending I/O */
	rpc = server->client_acl;
	if (!IS_ERR(rpc))
		rpc_killall_tasks(rpc);
	rpc = server->client;
	if (!IS_ERR(rpc))
		rpc_killall_tasks(rpc);
}

/*
 * Sanity-check a server address provided by the mount command
 */
static int nfs_verify_server_address(struct sockaddr *addr)
{
	switch (addr->sa_family) {
	case AF_INET: {
		struct sockaddr_in *sa = (struct sockaddr_in *) addr;
		if (sa->sin_addr.s_addr != INADDR_ANY)
			return 1;
		break;
	}
	}

	return 0;
}

/*
 * Error-check and convert a string of mount options from user space into
 * a data structure
 */
static int nfs_parse_mount_options(char *raw,
				   struct nfs_parsed_mount_data *mnt)
{
	char *p, *string;

	if (!raw) {
		dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
		return 1;
	}
	dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);

	while ((p = strsep(&raw, ",")) != NULL) {
		substring_t args[MAX_OPT_ARGS];
		int option, token;

		if (!*p)
			continue;

		dfprintk(MOUNT, "NFS:   parsing nfs mount option '%s'\n", p);

		token = match_token(p, nfs_mount_option_tokens, args);
		switch (token) {
		case Opt_soft:
			mnt->flags |= NFS_MOUNT_SOFT;
			break;
		case Opt_hard:
			mnt->flags &= ~NFS_MOUNT_SOFT;
			break;
		case Opt_intr:
			mnt->flags |= NFS_MOUNT_INTR;
			break;
		case Opt_nointr:
			mnt->flags &= ~NFS_MOUNT_INTR;
			break;
		case Opt_posix:
			mnt->flags |= NFS_MOUNT_POSIX;
			break;
		case Opt_noposix:
			mnt->flags &= ~NFS_MOUNT_POSIX;
			break;
		case Opt_cto:
			mnt->flags &= ~NFS_MOUNT_NOCTO;
			break;
		case Opt_nocto:
			mnt->flags |= NFS_MOUNT_NOCTO;
			break;
		case Opt_ac:
			mnt->flags &= ~NFS_MOUNT_NOAC;
			break;
		case Opt_noac:
			mnt->flags |= NFS_MOUNT_NOAC;
			break;
		case Opt_lock:
			mnt->flags &= ~NFS_MOUNT_NONLM;
			break;
		case Opt_nolock:
			mnt->flags |= NFS_MOUNT_NONLM;
			break;
		case Opt_v2:
			mnt->flags &= ~NFS_MOUNT_VER3;
			break;
		case Opt_v3:
			mnt->flags |= NFS_MOUNT_VER3;
			break;
		case Opt_udp:
			mnt->flags &= ~NFS_MOUNT_TCP;
			mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
			mnt->timeo = 7;
			mnt->retrans = 5;
			break;
		case Opt_tcp:
			mnt->flags |= NFS_MOUNT_TCP;
			mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
			mnt->timeo = 600;
			mnt->retrans = 2;
			break;
		case Opt_rdma:
			mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
			mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
			mnt->timeo = 600;
			mnt->retrans = 2;
			break;
		case Opt_acl:
			mnt->flags &= ~NFS_MOUNT_NOACL;
			break;
		case Opt_noacl:
			mnt->flags |= NFS_MOUNT_NOACL;
			break;
		case Opt_rdirplus:
			mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
			break;
		case Opt_nordirplus:
			mnt->flags |= NFS_MOUNT_NORDIRPLUS;
			break;
		case Opt_sharecache:
			mnt->flags &= ~NFS_MOUNT_UNSHARED;
			break;
		case Opt_nosharecache:
			mnt->flags |= NFS_MOUNT_UNSHARED;
			break;

		case Opt_port:
			if (match_int(args, &option))
				return 0;
			if (option < 0 || option > 65535)
				return 0;
			mnt->nfs_server.address.sin_port = htons(option);
			break;
		case Opt_rsize:
			if (match_int(args, &mnt->rsize))
				return 0;
			break;
		case Opt_wsize:
			if (match_int(args, &mnt->wsize))
				return 0;
			break;
		case Opt_bsize:
			if (match_int(args, &option))
				return 0;
			if (option < 0)
				return 0;
			mnt->bsize = option;
			break;
		case Opt_timeo:
			if (match_int(args, &mnt->timeo))
				return 0;
			break;
		case Opt_retrans:
			if (match_int(args, &mnt->retrans))
				return 0;
			break;
		case Opt_acregmin:
			if (match_int(args, &mnt->acregmin))
				return 0;
			break;
		case Opt_acregmax:
			if (match_int(args, &mnt->acregmax))
				return 0;
			break;
		case Opt_acdirmin:
			if (match_int(args, &mnt->acdirmin))
				return 0;
			break;
		case Opt_acdirmax:
			if (match_int(args, &mnt->acdirmax))
				return 0;
			break;
		case Opt_actimeo:
			if (match_int(args, &option))
				return 0;
			if (option < 0)
				return 0;
			mnt->acregmin =
			mnt->acregmax =
			mnt->acdirmin =
			mnt->acdirmax = option;
			break;
		case Opt_namelen:
			if (match_int(args, &mnt->namlen))
				return 0;
			break;
		case Opt_mountport:
			if (match_int(args, &option))
				return 0;
			if (option < 0 || option > 65535)
				return 0;
			mnt->mount_server.port = option;
			break;
		case Opt_mountprog:
			if (match_int(args, &option))
				return 0;
			if (option < 0)
				return 0;
			mnt->mount_server.program = option;
			break;
		case Opt_mountvers:
			if (match_int(args, &option))
				return 0;
			if (option < 0)
				return 0;
			mnt->mount_server.version = option;
			break;
		case Opt_nfsprog:
			if (match_int(args, &option))
				return 0;
			if (option < 0)
				return 0;
			mnt->nfs_server.program = option;
			break;
		case Opt_nfsvers:
			if (match_int(args, &option))
				return 0;
			switch (option) {
			case 2:
				mnt->flags &= ~NFS_MOUNT_VER3;
				break;
			case 3:
				mnt->flags |= NFS_MOUNT_VER3;
				break;
			default:
				goto out_unrec_vers;
			}
			break;

		case Opt_sec:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			token = match_token(string, nfs_secflavor_tokens, args);
			kfree(string);

			/*
			 * The flags setting is for v2/v3.  The flavor_len
			 * setting is for v4.  v2/v3 also need to know the
			 * difference between NULL and UNIX.
			 */
			switch (token) {
			case Opt_sec_none:
				mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
				mnt->auth_flavor_len = 0;
				mnt->auth_flavors[0] = RPC_AUTH_NULL;
				break;
			case Opt_sec_sys:
				mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
				mnt->auth_flavor_len = 0;
				mnt->auth_flavors[0] = RPC_AUTH_UNIX;
				break;
			case Opt_sec_krb5:
				mnt->flags |= NFS_MOUNT_SECFLAVOUR;
				mnt->auth_flavor_len = 1;
				mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
				break;
			case Opt_sec_krb5i:
				mnt->flags |= NFS_MOUNT_SECFLAVOUR;
				mnt->auth_flavor_len = 1;
				mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
				break;
			case Opt_sec_krb5p:
				mnt->flags |= NFS_MOUNT_SECFLAVOUR;
				mnt->auth_flavor_len = 1;
				mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
				break;
			case Opt_sec_lkey:
				mnt->flags |= NFS_MOUNT_SECFLAVOUR;
				mnt->auth_flavor_len = 1;
				mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
				break;
			case Opt_sec_lkeyi:
				mnt->flags |= NFS_MOUNT_SECFLAVOUR;
				mnt->auth_flavor_len = 1;
				mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
				break;
			case Opt_sec_lkeyp:
				mnt->flags |= NFS_MOUNT_SECFLAVOUR;
				mnt->auth_flavor_len = 1;
				mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
				break;
			case Opt_sec_spkm:
				mnt->flags |= NFS_MOUNT_SECFLAVOUR;
				mnt->auth_flavor_len = 1;
				mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
				break;
			case Opt_sec_spkmi:
				mnt->flags |= NFS_MOUNT_SECFLAVOUR;
				mnt->auth_flavor_len = 1;
				mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
				break;
			case Opt_sec_spkmp:
				mnt->flags |= NFS_MOUNT_SECFLAVOUR;
				mnt->auth_flavor_len = 1;
				mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
				break;
			default:
				goto out_unrec_sec;
			}
			break;
		case Opt_proto:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			token = match_token(string,
					    nfs_xprt_protocol_tokens, args);
			kfree(string);

			switch (token) {
			case Opt_xprt_udp:
				mnt->flags &= ~NFS_MOUNT_TCP;
				mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
				mnt->timeo = 7;
				mnt->retrans = 5;
				break;
			case Opt_xprt_tcp:
				mnt->flags |= NFS_MOUNT_TCP;
				mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
				mnt->timeo = 600;
				mnt->retrans = 2;
				break;
			case Opt_xprt_rdma:
				/* vector side protocols to TCP */
				mnt->flags |= NFS_MOUNT_TCP;
				mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
				mnt->timeo = 600;
				mnt->retrans = 2;
				break;
			default:
				goto out_unrec_xprt;
			}
			break;
		case Opt_mountproto:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			token = match_token(string,
					    nfs_xprt_protocol_tokens, args);
			kfree(string);

			switch (token) {
			case Opt_xprt_udp:
				mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
				break;
			case Opt_xprt_tcp:
				mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
				break;
			case Opt_xprt_rdma: /* not used for side protocols */
			default:
				goto out_unrec_xprt;
			}
			break;
		case Opt_addr:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			mnt->nfs_server.address.sin_family = AF_INET;
			mnt->nfs_server.address.sin_addr.s_addr =
							in_aton(string);
			kfree(string);
			break;
		case Opt_clientaddr:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			mnt->client_address = string;
			break;
		case Opt_mountaddr:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			mnt->mount_server.address.sin_family = AF_INET;
			mnt->mount_server.address.sin_addr.s_addr =
							in_aton(string);
			kfree(string);
			break;

		case Opt_userspace:
		case Opt_deprecated:
			break;

		default:
			goto out_unknown;
		}
	}

	return 1;

out_nomem:
	printk(KERN_INFO "NFS: not enough memory to parse option\n");
	return 0;

out_unrec_vers:
	printk(KERN_INFO "NFS: unrecognized NFS version number\n");
	return 0;