+ if (fsdb)
+ mgs_put_fsdb(mgs, fsdb);
+
+ RETURN(rc);
+}
+
+/**
+ * This is called for every record in llog. Some of records are
+ * skipped, others are copied to new log as is.
+ * Records to be skipped are
+ * marker records marked SKIP
+ * records enclosed between SKIP markers
+ *
+ * \param[in] llh log to be processed
+ * \param[in] rec current record
+ * \param[in] data mgs_replace_data structure
+ *
+ * \retval 0 success
+ **/
+static int mgs_clear_config_handler(const struct lu_env *env,
+ struct llog_handle *llh,
+ struct llog_rec_hdr *rec, void *data)
+{
+ struct mgs_replace_data *mrd;
+ struct lustre_cfg *lcfg = REC_DATA(rec);
+ int cfg_len = REC_DATA_LEN(rec);
+ int rc;
+
+ ENTRY;
+
+ mrd = (struct mgs_replace_data *)data;
+
+ if (rec->lrh_type != OBD_CFG_REC) {
+ CDEBUG(D_MGS, "Config llog Name=%s, Record Index=%u, "
+ "Unhandled Record Type=%#x\n", llh->lgh_name,
+ rec->lrh_index, rec->lrh_type);
+ RETURN(-EINVAL);
+ }
+
+ rc = lustre_cfg_sanity_check(lcfg, cfg_len);
+ if (rc) {
+ CDEBUG(D_MGS, "Config llog Name=%s, Invalid config file.",
+ llh->lgh_name);
+ RETURN(-EINVAL);
+ }
+
+ if (lcfg->lcfg_command == LCFG_MARKER) {
+ struct cfg_marker *marker;
+
+ marker = lustre_cfg_buf(lcfg, 1);
+ if (marker->cm_flags & CM_SKIP) {
+ if (marker->cm_flags & CM_START)
+ mrd->state = REPLACE_SKIP;
+ if (marker->cm_flags & CM_END)
+ mrd->state = REPLACE_COPY;
+ /* SKIP section started or finished */
+ CDEBUG(D_MGS, "Skip idx=%d, rc=%d, len=%d, "
+ "cmd %x %s %s\n", rec->lrh_index, rc,
+ rec->lrh_len, lcfg->lcfg_command,
+ lustre_cfg_string(lcfg, 0),
+ lustre_cfg_string(lcfg, 1));
+ RETURN(0);
+ }
+ } else {
+ if (mrd->state == REPLACE_SKIP) {
+ /* record enclosed between SKIP markers, skip it */
+ CDEBUG(D_MGS, "Skip idx=%d, rc=%d, len=%d, "
+ "cmd %x %s %s\n", rec->lrh_index, rc,
+ rec->lrh_len, lcfg->lcfg_command,
+ lustre_cfg_string(lcfg, 0),
+ lustre_cfg_string(lcfg, 1));
+ RETURN(0);
+ }
+ }
+
+ /* Record is placed in temporary llog as is */
+ rc = llog_write(env, mrd->temp_llh, rec, LLOG_NEXT_IDX);
+
+ CDEBUG(D_MGS, "Copied idx=%d, rc=%d, len=%d, cmd %x %s %s\n",
+ rec->lrh_index, rc, rec->lrh_len, lcfg->lcfg_command,
+ lustre_cfg_string(lcfg, 0), lustre_cfg_string(lcfg, 1));
+ RETURN(rc);
+}
+
+/*
+ * Directory CONFIGS/ may contain files which are not config logs to
+ * be cleared. Skip any llogs with a non-alphanumeric character after
+ * the last '-'. For example, fsname-MDT0000.sav, fsname-MDT0000.bak,
+ * fsname-MDT0000.orig, fsname-MDT0000~, fsname-MDT0000.20150516, etc.
+ */
+static bool config_to_clear(const char *logname)
+{
+ int i;
+ char *str;
+
+ str = strrchr(logname, '-');
+ if (!str)
+ return 0;
+
+ i = 0;
+ while (isalnum(str[++i]));
+ return str[i] == '\0';
+}
+
+/**
+ * Clear config logs for \a name
+ *
+ * \param env
+ * \param mgs MGS device
+ * \param name name of device or of filesystem
+ * (ex. lustre-OST0000 or lustre) in later case all logs
+ * will be cleared
+ *
+ * \retval 0 success
+ */
+int mgs_clear_configs(const struct lu_env *env,
+ struct mgs_device *mgs, const char *name)
+{
+ struct list_head dentry_list;
+ struct mgs_direntry *dirent, *n;
+ char *namedash;
+ int conn_state;
+ struct obd_device *mgs_obd = mgs->mgs_obd;
+ int rc;
+
+ ENTRY;
+
+ /* Prevent clients and servers from connecting to mgs */
+ spin_lock(&mgs_obd->obd_dev_lock);
+ conn_state = mgs_obd->obd_no_conn;
+ mgs_obd->obd_no_conn = 1;
+ spin_unlock(&mgs_obd->obd_dev_lock);
+
+ /*
+ * config logs cannot be cleaned if anything other than
+ * MGS is started
+ */
+ if (!only_mgs_is_running(mgs_obd)) {
+ CERROR("Only MGS is allowed to be started\n");
+ GOTO(out, rc = -EBUSY);
+ }
+
+ /* Find all the logs in the CONFIGS directory */
+ rc = class_dentry_readdir(env, mgs, &dentry_list);
+ if (rc) {
+ CERROR("%s: cannot read config directory '%s': rc = %d\n",
+ mgs_obd->obd_name, MOUNT_CONFIGS_DIR, rc);
+ GOTO(out, rc);
+ }
+
+ if (list_empty(&dentry_list)) {
+ CERROR("%s: list empty reading config dir '%s': rc = %d\n",
+ mgs_obd->obd_name, MOUNT_CONFIGS_DIR, -ENOENT);
+ GOTO(out, rc = -ENOENT);
+ }
+
+ OBD_ALLOC(namedash, strlen(name) + 2);
+ if (namedash == NULL)
+ GOTO(out, rc = -ENOMEM);
+ snprintf(namedash, strlen(name) + 2, "%s-", name);
+
+ list_for_each_entry(dirent, &dentry_list, mde_list) {
+ if (strcmp(name, dirent->mde_name) &&
+ strncmp(namedash, dirent->mde_name, strlen(namedash)))
+ continue;
+ if (!config_to_clear(dirent->mde_name))
+ continue;
+ CDEBUG(D_MGS, "%s: Clear config log %s\n",
+ mgs_obd->obd_name, dirent->mde_name);
+ rc = mgs_replace_log(env, mgs_obd, dirent->mde_name, NULL,
+ mgs_clear_config_handler, NULL);
+ if (rc)
+ break;
+ }
+
+ list_for_each_entry_safe(dirent, n, &dentry_list, mde_list) {
+ list_del_init(&dirent->mde_list);
+ mgs_direntry_free(dirent);
+ }
+ OBD_FREE(namedash, strlen(name) + 2);
+out:
+ spin_lock(&mgs_obd->obd_dev_lock);
+ mgs_obd->obd_no_conn = conn_state;
+ spin_unlock(&mgs_obd->obd_dev_lock);
+