diff options
| -rw-r--r-- | fs/nfs/super.c | 105 |
1 files changed, 95 insertions, 10 deletions
diff --git a/fs/nfs/super.c b/fs/nfs/super.c index 48db52a7067..757aa3b7e64 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -1051,10 +1051,28 @@ out_err: /* * Validate the NFS2/NFS3 mount data * - fills in the mount root filehandle + * + * For option strings, user space handles the following behaviors: + * + * + DNS: mapping server host name to IP address ("addr=" option) + * + * + failure mode: how to behave if a mount request can't be handled + * immediately ("fg/bg" option) + * + * + retry: how often to retry a mount request ("retry=" option) + * + * + breaking back: trying proto=udp after proto=tcp, v2 after v3, + * mountproto=tcp after mountproto=udp, and so on + * + * XXX: as far as I can tell, changing the NFS program number is not + * supported in the NFS client. */ -static int nfs_validate_mount_data(struct nfs_mount_data *data, - struct nfs_fh *mntfh) +static int nfs_validate_mount_data(struct nfs_mount_data **options, + struct nfs_fh *mntfh, + const char *dev_name) { + struct nfs_mount_data *data = *options; + if (data == NULL) goto out_no_data; @@ -1087,8 +1105,78 @@ static int nfs_validate_mount_data(struct nfs_mount_data *data, memset(mntfh->data + mntfh->size, 0, sizeof(mntfh->data) - mntfh->size); break; - default: - goto out_bad_version; + default: { + unsigned int len; + char *c; + int status; + struct nfs_parsed_mount_data args = { + .flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP), + .rsize = NFS_MAX_FILE_IO_SIZE, + .wsize = NFS_MAX_FILE_IO_SIZE, + .timeo = 600, + .retrans = 2, + .acregmin = 3, + .acregmax = 60, + .acdirmin = 30, + .acdirmax = 60, + .mount_server.protocol = IPPROTO_UDP, + .mount_server.program = NFS_MNT_PROGRAM, + .nfs_server.protocol = IPPROTO_TCP, + .nfs_server.program = NFS_PROGRAM, + }; + + if (nfs_parse_mount_options((char *) *options, &args) == 0) + return -EINVAL; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (data == NULL) + return -ENOMEM; + + /* + * NB: after this point, caller will free "data" + * if we return an error + */ + *options = data; + + c = strchr(dev_name, ':'); + if (c == NULL) + return -EINVAL; + len = c - dev_name - 1; + if (len > sizeof(data->hostname)) + return -EINVAL; + strncpy(data->hostname, dev_name, len); + args.nfs_server.hostname = data->hostname; + + c++; + if (strlen(c) > NFS_MAXPATHLEN) + return -EINVAL; + args.nfs_server.export_path = c; + + status = nfs_try_mount(&args, mntfh); + if (status) + return -EINVAL; + + /* + * Translate to nfs_mount_data, which nfs_fill_super + * can deal with. + */ + data->version = 6; + data->flags = args.flags; + data->rsize = args.rsize; + data->wsize = args.wsize; + data->timeo = args.timeo; + data->retrans = args.retrans; + data->acregmin = args.acregmin; + data->acregmax = args.acregmax; + data->acdirmin = args.acdirmin; + data->acdirmax = args.acdirmax; + data->addr = args.nfs_server.address; + data->namlen = args.namlen; + data->bsize = args.bsize; + data->pseudoflavor = args.auth_flavors[0]; + + break; + } } if (!(data->flags & NFS_MOUNT_SECFLAVOUR)) @@ -1117,11 +1205,6 @@ out_no_sec: dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n"); return -EINVAL; -out_bad_version: - dfprintk(MOUNT, "NFS: bad nfs_mount_data version %d\n", - data->version); - return -EINVAL; - #ifndef CONFIG_NFS_V3 out_v3_not_compiled: dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n"); @@ -1242,7 +1325,7 @@ static int nfs_get_sb(struct file_system_type *fs_type, int error; /* Validate the mount data */ - error = nfs_validate_mount_data(data, &mntfh); + error = nfs_validate_mount_data(&data, &mntfh, dev_name); if (error < 0) goto out; @@ -1283,6 +1366,8 @@ static int nfs_get_sb(struct file_system_type *fs_type, error = 0; out: + if (data != raw_data) + kfree(data); return error; out_err_nosb: |