+static int lprocfs_rd_mdt_som(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ struct obd_device *obd = data;
+ struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+
+ return snprintf(page, count, "%sabled\n",
+ mdt->mdt_som_conf ? "en" : "dis");
+}
+
+static int mdt_quota_off(struct mdt_device *mdt)
+{
+ struct md_device *next = mdt->mdt_child;
+ const struct md_quota_operations *mqo = &next->md_ops->mdo_quota;
+ struct lu_env env;
+ int rc;
+
+ lu_env_init(&env, LCT_MD_THREAD);
+ rc = mqo->mqo_off(&env, next, UGQUOTA | IMMQUOTA);
+ lu_env_fini(&env);
+ return rc;
+}
+
+static int lprocfs_wr_mdt_som(struct file *file, const char *buffer,
+ unsigned long count, void *data)
+{
+ struct obd_export *exp;
+ struct obd_device *obd = data;
+ struct mdt_device *mdt = mdt_dev(obd->obd_lu_dev);
+ char kernbuf[16];
+ unsigned long val = 0;
+ int rc;
+
+ if (count > (sizeof(kernbuf) - 1))
+ return -EINVAL;
+
+ if (copy_from_user(kernbuf, buffer, count))
+ return -EFAULT;
+
+ kernbuf[count] = '\0';
+
+ if (!strcmp(kernbuf, "enabled"))
+ val = 1;
+ else if (strcmp(kernbuf, "disabled"))
+ return -EINVAL;
+
+ if (mdt->mdt_som_conf == val)
+ return count;
+
+ if (!obd->obd_process_conf) {
+ CERROR("Temporary SOM change is not supported, use lctl "
+ "conf_param for permanent setting\n");
+ return count;
+ }
+
+ /* 1 stands for self export. */
+ list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain) {
+ if (exp == obd->obd_self_export)
+ continue;
+ if (exp->exp_connect_flags & OBD_CONNECT_MDS_MDS)
+ continue;
+ /* Some clients are already connected, skip the change */
+ LCONSOLE_INFO("%s is already connected, SOM will be %s on "
+ "the next mount\n", exp->exp_client_uuid.uuid,
+ val ? "enabled" : "disabled");
+ return count;
+ }
+
+ if ((rc = mdt_quota_off(mdt)))
+ return rc;
+
+ mdt->mdt_som_conf = val;
+ LCONSOLE_INFO("Enabling SOM\n");
+
+ return count;
+}
+
git://git.whamcloud.com / fs / lustre-release.git / commitdiff