*/
/*
* This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
*
* lustre/mdd/mdd_trans.c
*
#define DEBUG_SUBSYSTEM S_MDS
+#include <linux/kthread.h>
+
#include <obd_class.h>
#include <lprocfs_status.h>
#include <lustre_mds.h>
th = mdd_child_ops(mdd)->dt_trans_create(env, mdd->mdd_child);
if (!IS_ERR(th) && uc)
- th->th_ignore_quota = !!md_capable(uc, CFS_CAP_SYS_RESOURCE);
+ th->th_ignore_quota = !!cap_raised(uc->uc_cap, CAP_SYS_RESOURCE);
return th;
}
return mdd_child_ops(mdd)->dt_trans_start(env, mdd->mdd_child, th);
}
+struct mdd_changelog_gc {
+ struct mdd_device *mcgc_mdd;
+ __u32 mcgc_id;
+ __u32 mcgc_mintime;
+ __u64 mcgc_minrec;
+ char mcgc_name[CHANGELOG_USER_NAMELEN_FULL];
+};
+
+/* 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_rec2 *rec;
+ struct mdd_changelog_gc *mcgc = 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, typeof(*rec), cur_hdr);
+
+ if (rec->cur_endrec < mcgc->mcgc_minrec &&
+ (mdd->mdd_changelog_emrg_gc ||
+ mdd_changelog_is_too_idle(mdd, rec->cur_endrec, rec->cur_time))) {
+ mcgc->mcgc_mintime = rec->cur_time;
+ mcgc->mcgc_minrec = rec->cur_endrec;
+ mcgc->mcgc_id = rec->cur_id;
+ mdd_chlg_username(rec, mcgc->mcgc_name,
+ sizeof(mcgc->mcgc_name));
+ }
+ RETURN(0);
+}
+
+/* recover space from long-term inactive ChangeLog users */
+static int mdd_chlg_garbage_collect(void *data)
+{
+ struct mdd_device *mdd = data;
+ struct lu_env *env = NULL;
+ int rc;
+ struct llog_ctxt *ctxt;
+
+ ENTRY;
+
+ mdd->mdd_cl.mc_gc_task = current;
+
+ CDEBUG(D_HA, "%s: ChangeLog garbage collect thread start with PID %d\n",
+ mdd2obd_dev(mdd)->obd_name, current->pid);
+
+ OBD_ALLOC_PTR(env);
+ if (!env)
+ GOTO(out, rc = -ENOMEM);
+
+ rc = lu_env_init(env, LCT_MD_THREAD);
+ if (rc)
+ GOTO(out_free, rc);
+
+ ctxt = llog_get_context(mdd2obd_dev(mdd),
+ LLOG_CHANGELOG_USER_ORIG_CTXT);
+ if (!ctxt)
+ GOTO(out_env, rc = -ENXIO);
+ if (!(ctxt->loc_handle->lgh_hdr->llh_flags & LLOG_F_IS_CAT))
+ GOTO(out_ctxt, rc = -ENXIO);
+
+ for (;;) {
+ __u32 time_now = (__u32)ktime_get_real_seconds();
+ struct mdd_changelog_gc mcgc = {
+ .mcgc_mdd = mdd,
+ .mcgc_minrec = mdd->mdd_cl.mc_index,
+ .mcgc_name = { 0 },
+ };
+
+ rc = llog_cat_process(env, ctxt->loc_handle,
+ mdd_changelog_gc_cb, &mcgc, 0, 0);
+ if (rc)
+ GOTO(out_ctxt, rc);
+
+ if (!mcgc.mcgc_name[0])
+ break;
+
+ CWARN("%s: force deregister of changelog user %s idle for %us with %llu unprocessed records\n",
+ mdd2obd_dev(mdd)->obd_name, mcgc.mcgc_name,
+ time_now - mcgc.mcgc_mintime,
+ mdd->mdd_cl.mc_index - mcgc.mcgc_minrec);
+
+ mdd_changelog_user_purge(env, mdd, mcgc.mcgc_id);
+
+ if (mdd->mdd_changelog_emrg_gc &&
+ mdd_changelog_is_space_safe(env, mdd, ctxt->loc_handle, 0))
+ mdd->mdd_changelog_emrg_gc = false;
+
+ if (kthread_should_stop())
+ GOTO(out_ctxt, rc = 0);
+ }
+ EXIT;
+out_ctxt:
+ llog_ctxt_put(ctxt);
+out_env:
+ lu_env_fini(env);
+out_free:
+ OBD_FREE_PTR(env);
+out:
+ spin_lock(&mdd->mdd_cl.mc_lock);
+ mdd->mdd_cl.mc_gc_task = MDD_CHLG_GC_NONE;
+ spin_unlock(&mdd->mdd_cl.mc_lock);
+
+ return rc;
+}
+
int mdd_trans_stop(const struct lu_env *env, struct mdd_device *mdd,
int result, struct thandle *handle)
{
rc = mdd_child_ops(mdd)->dt_trans_stop(env, mdd->mdd_child, handle);
barrier_exit(mdd->mdd_bottom);
+ /* bottom half of changelog garbage-collection mechanism, started
+ * from mdd_changelog_store(). This is required, as running a
+ * kthead can't occur during a journal transaction is being filled
+ * because otherwise a deadlock can happen if memory reclaim is
+ * triggered by kthreadd when forking the new thread, and thus
+ * I/Os could be attempted to the same device from shrinkers
+ * requiring a new journal transaction to be started when current
+ * could never complete (LU-10680).
+ */
+ if (unlikely(mdd->mdd_cl.mc_flags & CLM_ON &&
+ cmpxchg(&mdd->mdd_cl.mc_gc_task, MDD_CHLG_GC_NEED,
+ MDD_CHLG_GC_START) == MDD_CHLG_GC_NEED)) {
+ /* XXX we may want to cmpxchg() only if MDD_CHLG_GC_NEED
+ * to save its cost in the frequent case and have an extra
+ * if/test cost in the rare case where we need to spawn?
+ */
+ struct task_struct *gc_task;
+ struct obd_device *obd = mdd2obd_dev(mdd);
+
+ 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 = MDD_CHLG_GC_NONE;
+ } else {
+ CDEBUG(D_HA, "%s: a ChangeLog garbage collection "
+ "thread has been started\n", obd->obd_name);
+ }
+ }
+
/* if operation failed, return \a result, otherwise return status of
* dt_trans_stop */
return result ?: rc;
git://git.whamcloud.com / fs / lustre-release.git / blobdiff