extractedLnx/linux-2.6.38/fs/nfs/super.c_nfs_parse_mount_options.c

static int nfs_parse_mount_options(char *raw,
				   struct nfs_parsed_mount_data *mnt)
{
	char *p, *string, *secdata;
	int rc, sloppy = 0, invalid_option = 0;
	unsigned short protofamily = AF_UNSPEC;
	unsigned short mountfamily = AF_UNSPEC;

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

	secdata = alloc_secdata();
	if (!secdata)
		goto out_nomem;

	rc = security_sb_copy_data(raw, secdata);
	if (rc)
		goto out_security_failure;

	rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
	if (rc)
		goto out_security_failure;

	free_secdata(secdata);

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

		/*
		 * boolean options:  foo/nofoo
		 */
		case Opt_soft:
			mnt->flags |= NFS_MOUNT_SOFT;
			break;
		case Opt_hard:
			mnt->flags &= ~NFS_MOUNT_SOFT;
			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;
			mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
					NFS_MOUNT_LOCAL_FCNTL);
			break;
		case Opt_nolock:
			mnt->flags |= NFS_MOUNT_NONLM;
			mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
				       NFS_MOUNT_LOCAL_FCNTL);
			break;
		case Opt_v2:
			mnt->flags &= ~NFS_MOUNT_VER3;
			mnt->version = 2;
			break;
		case Opt_v3:
			mnt->flags |= NFS_MOUNT_VER3;
			mnt->version = 3;
			break;
		case Opt_v4:
			mnt->flags &= ~NFS_MOUNT_VER3;
			mnt->version = 4;
			break;
		case Opt_udp:
			mnt->flags &= ~NFS_MOUNT_TCP;
			mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
			break;
		case Opt_tcp:
			mnt->flags |= NFS_MOUNT_TCP;
			mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
			break;
		case Opt_rdma:
			mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
			mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
			xprt_load_transport(p);
			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_resvport:
			mnt->flags &= ~NFS_MOUNT_NORESVPORT;
			break;
		case Opt_noresvport:
			mnt->flags |= NFS_MOUNT_NORESVPORT;
			break;
		case Opt_fscache:
			mnt->options |= NFS_OPTION_FSCACHE;
			kfree(mnt->fscache_uniq);
			mnt->fscache_uniq = NULL;
			break;
		case Opt_nofscache:
			mnt->options &= ~NFS_OPTION_FSCACHE;
			kfree(mnt->fscache_uniq);
			mnt->fscache_uniq = NULL;
			break;

		/*
		 * options that take numeric values
		 */
		case Opt_port:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0 || option > USHRT_MAX)
				goto out_invalid_value;
			mnt->nfs_server.port = option;
			break;
		case Opt_rsize:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
				goto out_invalid_value;
			mnt->rsize = option;
			break;
		case Opt_wsize:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
				goto out_invalid_value;
			mnt->wsize = option;
			break;
		case Opt_bsize:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
				goto out_invalid_value;
			mnt->bsize = option;
			break;
		case Opt_timeo:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0 || option == 0)
				goto out_invalid_value;
			mnt->timeo = option;
			break;
		case Opt_retrans:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0 || option == 0)
				goto out_invalid_value;
			mnt->retrans = option;
			break;
		case Opt_acregmin:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
				goto out_invalid_value;
			mnt->acregmin = option;
			break;
		case Opt_acregmax:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
				goto out_invalid_value;
			mnt->acregmax = option;
			break;
		case Opt_acdirmin:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
				goto out_invalid_value;
			mnt->acdirmin = option;
			break;
		case Opt_acdirmax:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
				goto out_invalid_value;
			mnt->acdirmax = option;
			break;
		case Opt_actimeo:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
				goto out_invalid_value;
			mnt->acregmin = mnt->acregmax =
			mnt->acdirmin = mnt->acdirmax = option;
			break;
		case Opt_namelen:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
				goto out_invalid_value;
			mnt->namlen = option;
			break;
		case Opt_mountport:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0 || option > USHRT_MAX)
				goto out_invalid_value;
			mnt->mount_server.port = option;
			break;
		case Opt_mountvers:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0 ||
			    option < NFS_MNT_VERSION ||
			    option > NFS_MNT3_VERSION)
				goto out_invalid_value;
			mnt->mount_server.version = option;
			break;
		case Opt_nfsvers:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
				goto out_invalid_value;
			switch (option) {
			case NFS2_VERSION:
				mnt->flags &= ~NFS_MOUNT_VER3;
				mnt->version = 2;
				break;
			case NFS3_VERSION:
				mnt->flags |= NFS_MOUNT_VER3;
				mnt->version = 3;
				break;
			case NFS4_VERSION:
				mnt->flags &= ~NFS_MOUNT_VER3;
				mnt->version = 4;
				break;
			default:
				goto out_invalid_value;
			}
			break;
		case Opt_minorversion:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = strict_strtoul(string, 10, &option);
			kfree(string);
			if (rc != 0)
				goto out_invalid_value;
			if (option > NFS4_MAX_MINOR_VERSION)
				goto out_invalid_value;
			mnt->minorversion = option;
			break;

		/*
		 * options that take text values
		 */
		case Opt_sec:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			rc = nfs_parse_security_flavors(string, mnt);
			kfree(string);
			if (!rc) {
				dfprintk(MOUNT, "NFS:   unrecognized "
						"security flavor\n");
				return 0;
			}
			break;
		case Opt_proto:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			token = match_token(string,
					    nfs_xprt_protocol_tokens, args);

			protofamily = AF_INET;
			switch (token) {
			case Opt_xprt_udp6:
				protofamily = AF_INET6;
			case Opt_xprt_udp:
				mnt->flags &= ~NFS_MOUNT_TCP;
				mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
				kfree(string);
				break;
			case Opt_xprt_tcp6:
				protofamily = AF_INET6;
			case Opt_xprt_tcp:
				mnt->flags |= NFS_MOUNT_TCP;
				mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
				kfree(string);
				break;
			case Opt_xprt_rdma:
				/* vector side protocols to TCP */
				mnt->flags |= NFS_MOUNT_TCP;
				mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
				xprt_load_transport(string);
				kfree(string);
				break;
			default:
				dfprintk(MOUNT, "NFS:   unrecognized "
						"transport protocol\n");
				kfree(string);
				return 0;
			}
			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);

			mountfamily = AF_INET;
			switch (token) {
			case Opt_xprt_udp6:
				mountfamily = AF_INET6;
			case Opt_xprt_udp:
				mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
				break;
			case Opt_xprt_tcp6:
				mountfamily = AF_INET6;
			case Opt_xprt_tcp:
				mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
				break;
			case Opt_xprt_rdma: /* not used for side protocols */
			default:
				dfprintk(MOUNT, "NFS:   unrecognized "
						"transport protocol\n");
				return 0;
			}
			break;
		case Opt_addr:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			mnt->nfs_server.addrlen =
				rpc_pton(string, strlen(string),
					(struct sockaddr *)
					&mnt->nfs_server.address,
					sizeof(mnt->nfs_server.address));
			kfree(string);
			if (mnt->nfs_server.addrlen == 0)
				goto out_invalid_address;
			break;
		case Opt_clientaddr:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			kfree(mnt->client_address);
			mnt->client_address = string;
			break;
		case Opt_mounthost:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			kfree(mnt->mount_server.hostname);
			mnt->mount_server.hostname = string;
			break;
		case Opt_mountaddr:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			mnt->mount_server.addrlen =
				rpc_pton(string, strlen(string),
					(struct sockaddr *)
					&mnt->mount_server.address,
					sizeof(mnt->mount_server.address));
			kfree(string);
			if (mnt->mount_server.addrlen == 0)
				goto out_invalid_address;
			break;
		case Opt_lookupcache:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			token = match_token(string,
					nfs_lookupcache_tokens, args);
			kfree(string);
			switch (token) {
				case Opt_lookupcache_all:
					mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
					break;
				case Opt_lookupcache_positive:
					mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
					mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
					break;
				case Opt_lookupcache_none:
					mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
					break;
				default:
					dfprintk(MOUNT, "NFS:   invalid "
							"lookupcache argument\n");
					return 0;
			};
			break;
		case Opt_fscache_uniq:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			kfree(mnt->fscache_uniq);
			mnt->fscache_uniq = string;
			mnt->options |= NFS_OPTION_FSCACHE;
			break;
		case Opt_local_lock:
			string = match_strdup(args);
			if (string == NULL)
				goto out_nomem;
			token = match_token(string, nfs_local_lock_tokens,
					args);
			kfree(string);
			switch (token) {
			case Opt_local_lock_all:
				mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
					       NFS_MOUNT_LOCAL_FCNTL);
				break;
			case Opt_local_lock_flock:
				mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
				break;
			case Opt_local_lock_posix:
				mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
				break;
			case Opt_local_lock_none:
				mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
						NFS_MOUNT_LOCAL_FCNTL);
				break;
			default:
				dfprintk(MOUNT, "NFS:	invalid	"
						"local_lock argument\n");
				return 0;
			};
			break;

		/*
		 * Special options
		 */
		case Opt_sloppy:
			sloppy = 1;
			dfprintk(MOUNT, "NFS:   relaxing parsing rules\n");
			break;
		case Opt_userspace:
		case Opt_deprecated:
			dfprintk(MOUNT, "NFS:   ignoring mount option "
					"'%s'\n", p);
			break;

		default:
			invalid_option = 1;
			dfprintk(MOUNT, "NFS:   unrecognized mount option "
					"'%s'\n", p);
		}
	}

	if (!sloppy && invalid_option)
		return 0;

	/*
	 * verify that any proto=/mountproto= options match the address
	 * familiies in the addr=/mountaddr= options.
	 */
	if (protofamily != AF_UNSPEC &&
	    protofamily != mnt->nfs_server.address.ss_family)
		goto out_proto_mismatch;

	if (mountfamily != AF_UNSPEC) {
		if (mnt->mount_server.addrlen) {
			if (mountfamily != mnt->mount_server.address.ss_family)
				goto out_mountproto_mismatch;
		} else {
			if (mountfamily != mnt->nfs_server.address.ss_family)
				goto out_mountproto_mismatch;
		}
	}

	return 1;

out_mountproto_mismatch:
	printk(KERN_INFO "NFS: mount server address does not match mountproto= "
			 "option\n");
	return 0;
out_proto_mismatch:
	printk(KERN_INFO "NFS: server address does not match proto= option\n");
	return 0;
out_invalid_address:
	printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
	return 0;
out_invalid_value:
	printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
	return 0;
out_nomem:
	printk(KERN_INFO "NFS: not enough memory to parse option\n");
	return 0;
out_security_failure:
	free_secdata(secdata);
	printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
	return 0;
}