+typedef struct option_map {
+ const char *name;
+ int mask;
+} option_map_t;
+
+static const option_map_t option_map[] = {
+ /* Canonicalized filesystem independent options from mount(8) */
+ { MNTOPT_NOAUTO, MS_COMMENT },
+ { MNTOPT_DEFAULTS, MS_COMMENT },
+ { MNTOPT_NODEVICES, MS_NODEV },
+ { MNTOPT_DIRSYNC, MS_DIRSYNC },
+ { MNTOPT_NOEXEC, MS_NOEXEC },
+ { MNTOPT_GROUP, MS_GROUP },
+ { MNTOPT_NETDEV, MS_COMMENT },
+ { MNTOPT_NOFAIL, MS_COMMENT },
+ { MNTOPT_NOSUID, MS_NOSUID },
+ { MNTOPT_OWNER, MS_OWNER },
+ { MNTOPT_REMOUNT, MS_REMOUNT },
+ { MNTOPT_RO, MS_RDONLY },
+ { MNTOPT_SYNC, MS_SYNCHRONOUS },
+ { MNTOPT_USER, MS_USERS },
+ { MNTOPT_USERS, MS_USERS },
+#ifdef MS_NOATIME
+ { MNTOPT_NOATIME, MS_NOATIME },
+#endif
+#ifdef MS_NODIRATIME
+ { MNTOPT_NODIRATIME, MS_NODIRATIME },
+#endif
+#ifdef MS_RELATIME
+ { MNTOPT_RELATIME, MS_RELATIME },
+#endif
+#ifdef MS_STRICTATIME
+ { MNTOPT_DFRATIME, MS_STRICTATIME },
+#endif
+#ifdef HAVE_SELINUX
+ { MNTOPT_CONTEXT, MS_COMMENT },
+ { MNTOPT_FSCONTEXT, MS_COMMENT },
+ { MNTOPT_DEFCONTEXT, MS_COMMENT },
+ { MNTOPT_ROOTCONTEXT, MS_COMMENT },
+#endif
+#ifdef MS_I_VERSION
+ { MNTOPT_IVERSION, MS_I_VERSION },
+#endif
+#ifdef MS_MANDLOCK
+ { MNTOPT_NBMAND, MS_MANDLOCK },
+#endif
+ /* Valid options not found in mount(8) */
+ { MNTOPT_BIND, MS_BIND },
+ { MNTOPT_RBIND, MS_BIND|MS_REC },
+ { MNTOPT_COMMENT, MS_COMMENT },
+ { MNTOPT_BOOTWAIT, MS_COMMENT },
+ { MNTOPT_NOBOOTWAIT, MS_COMMENT },
+ { MNTOPT_OPTIONAL, MS_COMMENT },
+ { MNTOPT_SHOWTHROUGH, MS_COMMENT },
+#ifdef MS_NOSUB
+ { MNTOPT_NOSUB, MS_NOSUB },
+#endif
+#ifdef MS_SILENT
+ { MNTOPT_QUIET, MS_SILENT },
+#endif
+ /* Custom zfs options */
+ { MNTOPT_NOXATTR, MS_COMMENT },
+ { NULL, 0 } };
+
+/*
+ * Break the mount option in to a name/value pair. The name is
+ * validated against the option map and mount flags set accordingly.
+ */
+static int
+parse_option(char *mntopt, unsigned long *mntflags, int sloppy)
+{
+ const option_map_t *opt;
+ char *ptr, *name, *value = NULL;
+ int rc;
+
+ name = strdup(mntopt);
+ if (name == NULL)
+ return (ENOMEM);
+
+ for (ptr = name; ptr && *ptr; ptr++) {
+ if (*ptr == '=') {
+ *ptr = '\0';
+ value = ptr+1;
+ break;
+ }
+ }
+
+ for (opt = option_map; opt->name != NULL; opt++) {
+ if (strncmp(name, opt->name, strlen(name)) == 0) {
+ *mntflags |= opt->mask;
+
+ /* MS_USERS implies default user options */
+ if (opt->mask & (MS_USERS))
+ *mntflags |= (MS_NOEXEC|MS_NOSUID|MS_NODEV);
+
+ /* MS_OWNER|MS_GROUP imply default owner options */
+ if (opt->mask & (MS_OWNER | MS_GROUP))
+ *mntflags |= (MS_NOSUID|MS_NODEV);
+
+ rc = 0;
+ goto out;
+ }
+ }
+
+ if (!sloppy)
+ rc = ENOENT;
+out:
+ /* If required further process on the value may be done here */
+ free(name);
+ return (rc);
+}
+