+#ifdef __KERNEL__
+ struct lprocfs_vars *var;
+ char *key, *sval;
+ int i, keylen, vallen;
+ int matched = 0, j = 0;
+ int rc = 0;
+ int skip = 0;
+ ENTRY;
+
+ if (lcfg->lcfg_command != LCFG_PARAM) {
+ CERROR("Unknown command: %d\n", lcfg->lcfg_command);
+ RETURN(-EINVAL);
+ }
+
+ /* e.g. tunefs.lustre --param mdt.group_upcall=foo /r/tmp/lustre-mdt
+ or lctl conf_param lustre-MDT0000.mdt.group_upcall=bar
+ or lctl conf_param lustre-OST0000.osc.max_dirty_mb=36 */
+ for (i = 1; i < lcfg->lcfg_bufcount; i++) {
+ key = lustre_cfg_buf(lcfg, i);
+ /* Strip off prefix */
+ if (class_match_param(key, prefix, &key))
+ /* If the prefix doesn't match, return error so we
+ * can pass it down the stack */
+ RETURN(-ENOSYS);
+ sval = strchr(key, '=');
+ if (!sval || (*(sval + 1) == 0)) {
+ CERROR("Can't parse param %s (missing '=')\n", key);
+ /* rc = -EINVAL; continue parsing other params */
+ continue;
+ }
+ keylen = sval - key;
+ sval++;
+ vallen = strlen(sval);
+ matched = 0;
+ j = 0;
+ /* Search proc entries */
+ while (lvars[j].name) {
+ var = &lvars[j];
+ if (class_match_param(key, (char *)var->name, 0) == 0 &&
+ keylen == strlen(var->name)) {
+ matched++;
+ rc = -EROFS;
+
+ if (var->write_fptr) {
+ mm_segment_t oldfs;
+ oldfs = get_fs();
+ set_fs(KERNEL_DS);
+ rc = (var->write_fptr)(NULL, sval,
+ vallen, data);
+ set_fs(oldfs);
+ }
+ break;
+ }
+ j++;
+ }
+ if (!matched) {
+ CERROR("%.*s: %s unknown param %s\n",
+ (int)strlen(prefix) - 1, prefix,
+ (char *)lustre_cfg_string(lcfg, 0), key);
+ /* rc = -EINVAL; continue parsing other params */
+ skip++;
+ } else if (rc < 0) {
+ CERROR("%s: error writing proc entry '%s': rc = %d\n",
+ prefix, var->name, rc);
+ rc = 0;
+ } else {
+ CDEBUG(D_CONFIG, "%s.%.*s: Set parameter %.*s=%s\n",
+ lustre_cfg_string(lcfg, 0),
+ (int)strlen(prefix) - 1, prefix,
+ (int)(sval - key - 1), key, sval);
+ }
+ }
+
+ if (rc > 0)
+ rc = 0;
+ if (!rc && skip)
+ rc = skip;
+ RETURN(rc);
+#else
+ CDEBUG(D_CONFIG, "liblustre can't process params.\n");
+ /* Don't throw config error */
+ RETURN(0);
+#endif
+}
+EXPORT_SYMBOL(class_process_proc_param);
+#endif
+
+int class_process_proc_seq_param(char *prefix, struct lprocfs_seq_vars *lvars,
+ struct lustre_cfg *lcfg, void *data)
+{
+#ifdef __KERNEL__
+ struct lprocfs_seq_vars *var;
+ struct file fakefile;
+ struct seq_file fake_seqfile;
+ char *key, *sval;
+ int i, keylen, vallen;
+ int matched = 0, j = 0;
+ int rc = 0;
+ int skip = 0;
+ ENTRY;
+
+ if (lcfg->lcfg_command != LCFG_PARAM) {
+ CERROR("Unknown command: %d\n", lcfg->lcfg_command);
+ RETURN(-EINVAL);
+ }
+
+ /* fake a seq file so that var->fops->write can work... */
+ fakefile.private_data = &fake_seqfile;
+ fake_seqfile.private = data;
+ /* e.g. tunefs.lustre --param mdt.group_upcall=foo /r/tmp/lustre-mdt
+ or lctl conf_param lustre-MDT0000.mdt.group_upcall=bar
+ or lctl conf_param lustre-OST0000.osc.max_dirty_mb=36 */
+ for (i = 1; i < lcfg->lcfg_bufcount; i++) {
+ key = lustre_cfg_buf(lcfg, i);
+ /* Strip off prefix */
+ if (class_match_param(key, prefix, &key))
+ /* If the prefix doesn't match, return error so we
+ * can pass it down the stack */
+ RETURN(-ENOSYS);
+ sval = strchr(key, '=');
+ if (!sval || (*(sval + 1) == 0)) {
+ CERROR("Can't parse param %s (missing '=')\n", key);
+ /* rc = -EINVAL; continue parsing other params */
+ continue;
+ }
+ keylen = sval - key;
+ sval++;
+ vallen = strlen(sval);
+ matched = 0;
+ j = 0;
+ /* Search proc entries */
+ while (lvars[j].name) {
+ var = &lvars[j];
+ if (class_match_param(key, (char *)var->name, 0) == 0 &&
+ keylen == strlen(var->name)) {
+ matched++;
+ rc = -EROFS;
+
+ if (var->fops && var->fops->write) {
+ mm_segment_t oldfs;
+ oldfs = get_fs();
+ set_fs(KERNEL_DS);
+ rc = (var->fops->write)(&fakefile, sval,
+ vallen, NULL);
+ set_fs(oldfs);
+ }
+ break;
+ }
+ j++;
+ }
+ if (!matched) {
+ CERROR("%.*s: %s unknown param %s\n",
+ (int)strlen(prefix) - 1, prefix,
+ (char *)lustre_cfg_string(lcfg, 0), key);
+ /* rc = -EINVAL; continue parsing other params */
+ skip++;
+ } else if (rc < 0) {
+ CERROR("%s: error writing proc entry '%s': rc = %d\n",
+ prefix, var->name, rc);
+ rc = 0;
+ } else {
+ CDEBUG(D_CONFIG, "%s.%.*s: Set parameter %.*s=%s\n",
+ lustre_cfg_string(lcfg, 0),
+ (int)strlen(prefix) - 1, prefix,
+ (int)(sval - key - 1), key, sval);
+ }
+ }
+
+ if (rc > 0)
+ rc = 0;
+ if (!rc && skip)
+ rc = skip;
+ RETURN(rc);
+#else
+ CDEBUG(D_CONFIG, "liblustre can't process params.\n");
+ /* Don't throw config error */
+ RETURN(0);
+#endif
+}
+EXPORT_SYMBOL(class_process_proc_seq_param);
+
+#ifdef __KERNEL__
+extern int lustre_check_exclusion(struct super_block *sb, char *svname);
+#else
+#define lustre_check_exclusion(a,b) 0
+#endif
+
+/*
+ * Supplemental functions for config logs, it allocates lustre_cfg
+ * buffers plus initialized llog record header at the beginning.
+ */
+struct llog_cfg_rec *lustre_cfg_rec_new(int cmd, struct lustre_cfg_bufs *bufs)
+{
+ struct llog_cfg_rec *lcr;
+ int reclen;
+
+ ENTRY;
+
+ reclen = lustre_cfg_len(bufs->lcfg_bufcount, bufs->lcfg_buflen);
+ reclen = llog_data_len(reclen) + sizeof(struct llog_rec_hdr) +
+ sizeof(struct llog_rec_tail);
+
+ OBD_ALLOC(lcr, reclen);
+ if (lcr == NULL)
+ RETURN(NULL);
+
+ lustre_cfg_init(&lcr->lcr_cfg, cmd, bufs);
+
+ lcr->lcr_hdr.lrh_len = reclen;
+ lcr->lcr_hdr.lrh_type = OBD_CFG_REC;
+
+ RETURN(lcr);
+}
+EXPORT_SYMBOL(lustre_cfg_rec_new);
+
+void lustre_cfg_rec_free(struct llog_cfg_rec *lcr)
+{
+ ENTRY;
+ OBD_FREE(lcr, lcr->lcr_hdr.lrh_len);
+ EXIT;
+}
+EXPORT_SYMBOL(lustre_cfg_rec_free);
+
+/** Parse a configuration llog, doing various manipulations on them
+ * for various reasons, (modifications for compatibility, skip obsolete
+ * records, change uuids, etc), then class_process_config() resulting
+ * net records.
+ */
+int class_config_llog_handler(const struct lu_env *env,
+ struct llog_handle *handle,
+ struct llog_rec_hdr *rec, void *data)
+{
+ struct config_llog_instance *clli = data;