LU-5331 obdclass: serialize lu_site purge

[fs/lustre-release.git] / lustre / obdclass / lu_object.c

diff --git a/lustre/obdclass/lu_object.c b/lustre/obdclass/lu_object.c
index 618c5bc..86ccdc4 100644 (file)
--- a/lustre/obdclass/lu_object.c
+++ b/lustre/obdclass/lu_object.c
@@ -367,6 +367,11 @@ int lu_site_purge(const struct lu_env *env, struct lu_site *s, int nr)
         start = s->ls_purge_start;
         bnr = (nr == ~0) ? -1 : nr / CFS_HASH_NBKT(s->ls_obj_hash) + 1;
  again:
+       /*
+        * It doesn't make any sense to make purge threads parallel, that can
+        * only bring troubles to us. See LU-5331.
+        */
+       mutex_lock(&s->ls_purge_mutex);
         did_sth = 0;
         cfs_hash_for_each_bucket(s->ls_obj_hash, &bd, i) {
                 if (i < start)
@@ -411,6 +416,7 @@ int lu_site_purge(const struct lu_env *env, struct lu_site *s, int nr)
                 if (nr == 0)
                         break;
         }
+       mutex_unlock(&s->ls_purge_mutex);
 
         if (nr != 0 && did_sth && start != 0) {
                 start = 0; /* restart from the first bucket */
@@ -1095,6 +1101,7 @@ int lu_site_init(struct lu_site *s, struct lu_device *top)
        ENTRY;
 
        memset(s, 0, sizeof *s);
+       mutex_init(&s->ls_purge_mutex);
        bits = lu_htable_order(top);
        snprintf(name, 16, "lu_site_%s", top->ld_type->ldt_name);
        for (bits = min(max(LU_SITE_BITS_MIN, bits), LU_SITE_BITS_MAX);