For NFSv2 and NFSv3 mount options.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
fs/nfs/super.c | 449 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 449 insertions(+), 0 deletions(-)
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 1974648..a9f698b 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -514,6 +514,455 @@ static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
shrink_submounts(vfsmnt, &nfs_automount_list);
}
+
+static match_table_t nfs_tokens = {
+ {Opt_userspace, "bg"},
+ {Opt_userspace, "fg"},
+ {Opt_soft, "soft"},
+ {Opt_hard, "hard"},
+ {Opt_intr, "intr"},
+ {Opt_nointr, "nointr"},
+ {Opt_posix, "posix"},
+ {Opt_noposix, "noposix"},
+ {Opt_cto, "cto"},
+ {Opt_nocto, "nocto"},
+ {Opt_ac, "ac"},
+ {Opt_noac, "noac"},
+ {Opt_lock, "lock"},
+ {Opt_nolock, "nolock"},
+ {Opt_v2, "v2"},
+ {Opt_v3, "v3"},
+ {Opt_udp, "udp"},
+ {Opt_tcp, "tcp"},
+ {Opt_acl, "acl"},
+ {Opt_noacl, "noacl"},
+
+ {Opt_port, "port=%u"},
+ {Opt_rsize, "rsize=%u"},
+ {Opt_wsize, "wsize=%u"},
+ {Opt_timeo, "timeo=%u"},
+ {Opt_retrans, "retrans=%u"},
+ {Opt_acregmin, "acregmin=%u"},
+ {Opt_acregmax, "acregmax=%u"},
+ {Opt_acdirmin, "acdirmin=%u"},
+ {Opt_acdirmax, "acdirmax=%u"},
+ {Opt_actimeo, "actimeo=%u"},
+ {Opt_userspace, "retry=%u"},
+ {Opt_namelen, "namlen=%u"},
+ {Opt_mountport, "mountport=%u"},
+ {Opt_mountprog, "mountprog=%u"},
+ {Opt_mountvers, "mountvers=%u"},
+ {Opt_nfsprog, "nfsprog=%u"},
+ {Opt_nfsvers, "nfsvers=%u"},
+ {Opt_nfsvers, "vers=%u"},
+
+ {Opt_sec, "sec=%s"},
+ {Opt_proto, "proto=%s"},
+ {Opt_addr, "addr=%s"},
+ {Opt_mounthost, "mounthost=%s"},
+ {Opt_context, "context=%s"},
+
+ {Opt_err, NULL},
+};
+
+static int nfs_parse_options(char *raw, struct nfs_mount_args *mnt)
+{
+ char *p, *string;
+
+ if (!raw) {
+ dprintk("NFS: mount options string was NULL.\n");
+ return 1;
+ }
+
+ while ((p = strsep (&raw, ",")) != NULL) {
+ substring_t args[MAX_OPT_ARGS];
+ int option, token;
+
+ if (!*p)
+ continue;
+ token = match_token(p, nfs_tokens, args);
+
+ dprintk("NFS: nfs mount option '%s': parsing token %d\n",
+ p, token);
+
+ switch (token) {
+ case Opt_soft:
+ mnt->nmd.flags |= NFS_MOUNT_SOFT;
+ break;
+ case Opt_hard:
+ mnt->nmd.flags &= ~NFS_MOUNT_SOFT;
+ break;
+ case Opt_intr:
+ mnt->nmd.flags |= NFS_MOUNT_INTR;
+ break;
+ case Opt_nointr:
+ mnt->nmd.flags &= ~NFS_MOUNT_INTR;
+ break;
+ case Opt_posix:
+ mnt->nmd.flags |= NFS_MOUNT_POSIX;
+ break;
+ case Opt_noposix:
+ mnt->nmd.flags &= ~NFS_MOUNT_POSIX;
+ break;
+ case Opt_cto:
+ mnt->nmd.flags &= ~NFS_MOUNT_NOCTO;
+ break;
+ case Opt_nocto:
+ mnt->nmd.flags |= NFS_MOUNT_NOCTO;
+ break;
+ case Opt_ac:
+ mnt->nmd.flags &= ~NFS_MOUNT_NOAC;
+ break;
+ case Opt_noac:
+ mnt->nmd.flags |= NFS_MOUNT_NOAC;
+ break;
+ case Opt_lock:
+ mnt->nmd.flags &= ~NFS_MOUNT_NONLM;
+ break;
+ case Opt_nolock:
+ mnt->nmd.flags |= NFS_MOUNT_NONLM;
+ break;
+ case Opt_v2:
+ mnt->nmd.flags &= ~NFS_MOUNT_VER3;
+ break;
+ case Opt_v3:
+ mnt->nmd.flags |= NFS_MOUNT_VER3;
+ break;
+ case Opt_udp:
+ mnt->nmd.flags &= ~NFS_MOUNT_TCP;
+ break;
+ case Opt_tcp:
+ mnt->nmd.flags |= NFS_MOUNT_TCP;
+ break;
+ case Opt_acl:
+ mnt->nmd.flags &= ~NFS_MOUNT_NOACL;
+ break;
+ case Opt_noacl:
+ mnt->nmd.flags |= NFS_MOUNT_NOACL;
+ break;
+
+ case Opt_port:
+ if (match_int(args, &option))
+ return 0;
+ if (option < 0 || option > 65535)
+ return 0;
+ mnt->nmd.addr.sin_port = htonl(option);
+ break;
+ case Opt_rsize:
+ if (match_int(args, &mnt->nmd.rsize))
+ return 0;
+ break;
+ case Opt_wsize:
+ if (match_int(args, &mnt->nmd.wsize))
+ return 0;
+ break;
+ case Opt_timeo:
+ if (match_int(args, &mnt->nmd.timeo))
+ return 0;
+ break;
+ case Opt_retrans:
+ if (match_int(args, &mnt->nmd.retrans))
+ return 0;
+ break;
+ case Opt_acregmin:
+ if (match_int(args, &mnt->nmd.acregmin))
+ return 0;
+ break;
+ case Opt_acregmax:
+ if (match_int(args, &mnt->nmd.acregmax))
+ return 0;
+ break;
+ case Opt_acdirmin:
+ if (match_int(args, &mnt->nmd.acdirmin))
+ return 0;
+ break;
+ case Opt_acdirmax:
+ if (match_int(args, &mnt->nmd.acdirmax))
+ return 0;
+ break;
+ case Opt_actimeo:
+ if (match_int(args, &option))
+ return 0;
+ if (option < 0)
+ return 0;
+ mnt->nmd.acregmin =
+ mnt->nmd.acregmax =
+ mnt->nmd.acdirmin =
+ mnt->nmd.acdirmax = option;
+ break;
+ case Opt_namelen:
+ if (match_int(args, &mnt->nmd.namlen))
+ return 0;
+ break;
+ case Opt_mountport:
+ if (match_int(args, &option))
+ return 0;
+ if (option < 0 || option > 65535)
+ return 0;
+ mnt->mnthost.sin_port = htonl(option);
+ break;
+ case Opt_mountprog:
+ if (match_int(args, &option))
+ return 0;
+ if (option < 0)
+ return 0;
+ mnt->mntprog = option;
+ break;
+ case Opt_mountvers:
+ if (match_int(args, &option))
+ return 0;
+ if (option < 0)
+ return 0;
+ mnt->mntvers = option;
+ break;
+ case Opt_nfsprog:
+ if (match_int(args, &option))
+ return 0;
+ if (option < 0)
+ return 0;
+ mnt->nfsprog = option;
+ break;
+ case Opt_nfsvers:
+ if (match_int(args, &option))
+ return 0;
+ switch (option) {
+ case 2:
+ mnt->nmd.flags &= ~NFS_MOUNT_VER3;
+ break;
+ case 3:
+ mnt->nmd.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_sec_tokens, args);
+ kfree(string);
+
+ mnt->nmd.flags |= NFS_MOUNT_SECFLAVOUR;
+
+ switch (token) {
+ case Opt_sec_none:
+ mnt->nmd.flags &= ~NFS_MOUNT_SECFLAVOUR;
+ mnt->nmd.pseudoflavor = RPC_AUTH_NULL;
+ break;
+ case Opt_sec_sys:
+ mnt->nmd.flags &= ~NFS_MOUNT_SECFLAVOUR;
+ mnt->nmd.pseudoflavor = RPC_AUTH_UNIX;
+ break;
+ case Opt_sec_krb5:
+ mnt->nmd.pseudoflavor = RPC_AUTH_GSS_KRB5;
+ break;
+ case Opt_sec_krb5i:
+ mnt->nmd.pseudoflavor = RPC_AUTH_GSS_KRB5I;
+ break;
+ case Opt_sec_krb5p:
+ mnt->nmd.pseudoflavor = RPC_AUTH_GSS_KRB5P;
+ break;
+ case Opt_sec_lkey:
+ mnt->nmd.pseudoflavor = RPC_AUTH_GSS_LKEY;
+ break;
+ case Opt_sec_lkeyi:
+ mnt->nmd.pseudoflavor = RPC_AUTH_GSS_LKEYI;
+ break;
+ case Opt_sec_lkeyp:
+ mnt->nmd.pseudoflavor = RPC_AUTH_GSS_LKEYP;
+ break;
+ case Opt_sec_spkm:
+ mnt->nmd.pseudoflavor = RPC_AUTH_GSS_SPKM;
+ break;
+ case Opt_sec_spkmi:
+ mnt->nmd.pseudoflavor = RPC_AUTH_GSS_SPKMI;
+ break;
+ case Opt_sec_spkmp:
+ mnt->nmd.pseudoflavor = RPC_AUTH_GSS_SPKMP;
+ break;
+ default:
+ goto out_unrec_sec;
+ }
+ break;
+ }
+ case Opt_proto:
+ string = match_strdup(args);
+ if (string == NULL)
+ goto out_nomem;
+ if (strcmp(string, "udp") == 0) {
+ mnt->nmd.flags &= ~NFS_MOUNT_TCP;
+ kfree(string);
+ break;
+ }
+ if (strcmp(string, "tcp") == 0) {
+ mnt->nmd.flags |= NFS_MOUNT_TCP;
+ kfree(string);
+ break;
+ }
+ goto out_unrec_xprt;
+ case Opt_addr:
+ string = match_strdup(args);
+ if (string == NULL)
+ goto out_nomem;
+ mnt->nmd.addr.sin_family = AF_INET;
+ mnt->nmd.addr.sin_addr.s_addr = in_aton(string);
+ kfree(string);
+ break;
+ case Opt_mounthost:
+ string = match_strdup(args);
+ if (string == NULL)
+ goto out_nomem;
+ mnt->mnthost.sin_family = AF_INET;
+ mnt->mnthost.sin_addr.s_addr = in_aton(string);
+ kfree(string);
+ mnt->use_mnthost = 1;
+ break;
+ case Opt_context:
+ match_strcpy(mnt->nmd.context, args);
+ 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;
+
+out_unrec_xprt:
+ printk(KERN_INFO "NFS: unrecognized transport protocol\n");
+ return 0;
+
+out_unrec_sec:
+ printk(KERN_INFO "NFS: unrecognized security flavor\n");
+ return 0;
+
+out_unknown:
+ printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
+ return 0;
+}
+
+/*
+ * Use the remote server's MOUNT service to request the NFS file handle
+ * corresponding to the provided path.
+ */
+static int nfs_try_mount(struct nfs_mount_data *nmd, char *path)
+{
+ struct nfs_mount_args *args;
+ int status, version, protocol;
+ struct sockaddr_in sin;
+ struct nfs_fh fh;
+
+ args = container_of(nmd, struct nfs_mount_args, nmd);
+ if (args->mntvers == 0) {
+ version = (args->nmd.flags & NFS_MOUNT_VER3) ?
+ NFS_MNT3_VERSION : NFS_MNT_VERSION;
+ } else
+ version = args->mntvers;
+ protocol = (args->nmd.flags & NFS_MOUNT_TCP) ?
+ IPPROTO_TCP : IPPROTO_UDP;
+
+ sin.sin_family = AF_INET;
+ if (args->use_mnthost == 0)
+ sin.sin_addr.s_addr = args->nmd.addr.sin_addr.s_addr;
+ else
+ sin.sin_addr.s_addr = args->mnthost.sin_addr.s_addr;
+ if (args->mntport == 0) {
+ status = rpcb_getport_sync(&sin, args->mntprog, version, protocol);
+ if (status < 0)
+ goto out_bind_err;
+ sin.sin_port = htons(status);
+ } else
+ sin.sin_port = htons(args->mntport);
+
+ sin.sin_addr.s_addr = args->nmd.addr.sin_addr.s_addr;
+ status = nfs_mount(&sin, path, &fh, version, protocol);
+ if (status < 0)
+ goto out_mnt_err;
+
+ args->nmd.root.size = fh.size;
+ memcpy(args->nmd.root.data, fh.data, fh.size);
+ return status;
+
+out_bind_err:
+ printk(KERN_INFO "NFS: unable to contact bind server on host %s\n",
+ nmd->hostname);
+ return status;
+out_mnt_err:
+ printk(KERN_INFO "NFS: unable to contact NFS server on host %s\n",
+ nmd->hostname);
+ return status;
+}
+
+/*
+ * Convert a string of nfs mount options into an nfs_mount_data struct.
+ *
+ * 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 UDP after TCP, and v2 after v3
+ *
+ * XXX: as far as I can tell, changing the NFS program is not really supported
+ * in the NFS client.
+ *
+ */
+static struct nfs_mount_data *nfs_convert_mount_opts(const char *options)
+{
+ struct nfs_mount_args *args;
+
+ dprintk("NFS: nfs mount opts='%s'\n", options);
+
+ args = kzalloc(sizeof(*args), GFP_KERNEL);
+ if (args == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ args->nmd.version = 7;
+
+ args->nmd.flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
+ args->nmd.rsize = NFS_MAX_FILE_IO_SIZE;
+ args->nmd.wsize = NFS_MAX_FILE_IO_SIZE;
+ args->nmd.timeo = 600; /* in tenths of a second */
+ args->nmd.retrans = 2;
+ args->nmd.acregmin = 3;
+ args->nmd.acregmax = 60;
+ args->nmd.acdirmin = 30;
+ args->nmd.acdirmax = 60;
+
+ args->nfsprog = NFS_PROGRAM;
+ args->use_mnthost = 0;
+ args->mntprog = NFS_MNT_PROGRAM;
+ args->mntvers = 0;
+ args->mntport = 0;
+
+ if (nfs_parse_options((char *) options, args) == 0)
+ goto out_err;
+
+ return &args->nmd;
+
+out_err:
+ kfree(args);
+ return ERR_PTR(-EINVAL);
+}
+
/*
* Sanity-check a server address provided by the mount command
*/
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