return rc;
}
+struct mdd_changelog_gc {
+ struct mdd_device *mcgc_mdd;
+ bool mcgc_found;
+ __u32 mcgc_maxtime;
+ __u64 mcgc_maxindexes;
+ __u32 mcgc_id;
+};
+
+/* return first registered ChangeLog user idle since too long
+ * use ChangeLog's user plain LLOG mtime for this */
+static int mdd_changelog_gc_cb(const struct lu_env *env,
+ struct llog_handle *llh,
+ struct llog_rec_hdr *hdr, void *data)
+{
+ struct llog_changelog_user_rec *rec;
+ struct mdd_changelog_gc *mcgc = (struct mdd_changelog_gc *)data;
+ struct mdd_device *mdd = mcgc->mcgc_mdd;
+ ENTRY;
+
+ if ((llh->lgh_hdr->llh_flags & LLOG_F_IS_PLAIN) == 0)
+ RETURN(-ENXIO);
+
+ rec = container_of(hdr, struct llog_changelog_user_rec,
+ cur_hdr);
+
+ /* find oldest idle user, based on last record update/cancel time (new
+ * behavior), or for old user records, last record index vs current
+ * ChangeLog index. Late users with old record format will be treated
+ * first as we assume they could be idle since longer
+ */
+ if (rec->cur_time != 0) {
+ __u32 time_now = (__u32)get_seconds();
+ __u32 time_out = rec->cur_time +
+ mdd->mdd_changelog_max_idle_time;
+ __u32 idle_time = time_now - rec->cur_time;
+
+ /* treat oldest idle user first, and if no old format user
+ * has been already selected
+ */
+ if (time_after32(time_now, time_out) &&
+ idle_time > mcgc->mcgc_maxtime &&
+ mcgc->mcgc_maxindexes == 0) {
+ mcgc->mcgc_maxtime = idle_time;
+ mcgc->mcgc_id = rec->cur_id;
+ mcgc->mcgc_found = true;
+ }
+ } else {
+ /* old user record with no idle time stamp, so use empirical
+ * method based on its current index/position
+ */
+ __u64 idle_indexes;
+
+ idle_indexes = mdd->mdd_cl.mc_index - rec->cur_endrec;
+
+ /* treat user with the oldest/smallest current index first */
+ if (idle_indexes >= mdd->mdd_changelog_max_idle_indexes &&
+ idle_indexes > mcgc->mcgc_maxindexes) {
+ mcgc->mcgc_maxindexes = idle_indexes;
+ mcgc->mcgc_id = rec->cur_id;
+ mcgc->mcgc_found = true;
+ }
+
+ }
+ RETURN(0);
+}
+
+/* recover space from long-term inactive ChangeLog users */
+static int mdd_chlg_garbage_collect(void *data)
+{
+ struct mdd_device *mdd = (struct mdd_device *)data;
+ struct lu_env *env = NULL;
+ int rc;
+ struct llog_ctxt *ctxt;
+ struct mdd_changelog_gc mcgc = {
+ .mcgc_mdd = mdd,
+ .mcgc_found = false,
+ .mcgc_maxtime = 0,
+ .mcgc_maxindexes = 0,
+ };
+ ENTRY;
+
+ CDEBUG(D_HA, "%s: ChangeLog garbage collect thread start\n",
+ mdd2obd_dev(mdd)->obd_name);
+
+ OBD_ALLOC_PTR(env);
+ if (env == NULL)
+ GOTO(out, rc = -ENOMEM);
+
+ rc = lu_env_init(env, LCT_MD_THREAD);
+ if (rc)
+ GOTO(out, rc);
+
+ for (;;) {
+ ctxt = llog_get_context(mdd2obd_dev(mdd),
+ LLOG_CHANGELOG_USER_ORIG_CTXT);
+ if (ctxt == NULL ||
+ (ctxt->loc_handle->lgh_hdr->llh_flags & LLOG_F_IS_CAT) == 0)
+ GOTO(out_env, rc = -ENXIO);
+
+ rc = llog_cat_process(env, ctxt->loc_handle,
+ mdd_changelog_gc_cb, &mcgc, 0, 0);
+ if (rc != 0 || mcgc.mcgc_found == false)
+ break;
+ llog_ctxt_put(ctxt);
+
+ CWARN("%s: Force deregister of ChangeLog user cl%d idle more "
+ "than %us\n", mdd2obd_dev(mdd)->obd_name, mcgc.mcgc_id,
+ mcgc.mcgc_maxtime);
+
+ mdd_changelog_user_purge(env, mdd, mcgc.mcgc_id);
+
+ /* try again to search for another candidate */
+ mcgc.mcgc_found = false;
+ mcgc.mcgc_maxtime = 0;
+ mcgc.mcgc_maxindexes = 0;
+ }
+
+out_env:
+ if (ctxt != NULL)
+ llog_ctxt_put(ctxt);
+
+ lu_env_fini(env);
+ GOTO(out, rc);
+out:
+ if (env)
+ OBD_FREE_PTR(env);
+ mdd->mdd_cl.mc_gc_task = NULL;
+ return rc;
+}
+
/** Add a changelog entry \a rec to the changelog llog
* \param mdd
* \param rec
struct llog_ctxt *ctxt;
struct thandle *llog_th;
int rc;
+ bool run_gc_task;
rec->cr_hdr.lrh_len = llog_data_len(sizeof(*rec) +
changelog_rec_varsize(&rec->cr));
/* nested journal transaction */
rc = llog_add(env, ctxt->loc_handle, &rec->cr_hdr, NULL, llog_th);
+ /* time to recover some space ?? */
+ spin_lock(&mdd->mdd_cl.mc_lock);
+ if (unlikely(mdd->mdd_changelog_gc && (ktime_get_real_seconds() -
+ mdd->mdd_cl.mc_gc_time > mdd->mdd_changelog_min_gc_interval) &&
+ mdd->mdd_cl.mc_gc_task == NULL &&
+ llog_cat_free_space(ctxt->loc_handle) <=
+ mdd->mdd_changelog_min_free_cat_entries)) {
+ CWARN("%s: low on changelog_catalog free entries, starting "
+ "ChangeLog garbage collection thread\n", obd->obd_name);
+
+ /* indicate further kthread run will occur outside right after
+ * critical section
+ */
+ mdd->mdd_cl.mc_gc_task = (struct task_struct *)(-1);
+ run_gc_task = true;
+ }
+ spin_unlock(&mdd->mdd_cl.mc_lock);
+ if (run_gc_task) {
+ struct task_struct *gc_task;
+
+ gc_task = kthread_run(mdd_chlg_garbage_collect, mdd,
+ "chlg_gc_thread");
+ if (IS_ERR(gc_task)) {
+ CERROR("%s: cannot start ChangeLog garbage collection "
+ "thread: rc = %ld\n", obd->obd_name,
+ PTR_ERR(gc_task));
+ mdd->mdd_cl.mc_gc_task = NULL;
+ } else {
+ CDEBUG(D_HA, "%s: ChangeLog garbage collection thread "
+ "has started with Pid %d\n", obd->obd_name,
+ gc_task->pid);
+ mdd->mdd_cl.mc_gc_task = gc_task;
+ mdd->mdd_cl.mc_gc_time = ktime_get_real_seconds();
+ }
+ }
out_put:
llog_ctxt_put(ctxt);
if (rc > 0)
git://git.whamcloud.com / fs / lustre-release.git / blobdiff