dlm: change rsbtbl rwlock to spinlock

The rwlock is almost always used in write mode, so there's no reason
to not use a spinlock instead.

Signed-off-by: David Teigland <teigland@redhat.com>

1 files changed, 12 insertions, 12 deletions

diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index bc4af3ef65a..1d1d2744223 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -416,7 +416,7 @@ static void *table_seq_start(struct seq_file *seq, loff_t *pos)
         if (seq->op == &format3_seq_ops)
                 ri->format = 3;
 
-        read_lock(&ls->ls_rsbtbl[bucket].lock);
+        spin_lock(&ls->ls_rsbtbl[bucket].lock);
         if (!list_empty(&ls->ls_rsbtbl[bucket].list)) {
                 list_for_each_entry(r, &ls->ls_rsbtbl[bucket].list,
                                     res_hashchain) {
@@ -424,12 +424,12 @@ static void *table_seq_start(struct seq_file *seq, loff_t *pos)
                                 dlm_hold_rsb(r);
                                 ri->rsb = r;
                                 ri->bucket = bucket;
-                                read_unlock(&ls->ls_rsbtbl[bucket].lock);
+                                spin_unlock(&ls->ls_rsbtbl[bucket].lock);
                                 return ri;
                         }
                 }
         }
-        read_unlock(&ls->ls_rsbtbl[bucket].lock);
+        spin_unlock(&ls->ls_rsbtbl[bucket].lock);
 
         /*
          * move to the first rsb in the next non-empty bucket
@@ -447,18 +447,18 @@ static void *table_seq_start(struct seq_file *seq, loff_t *pos)
                         return NULL;
                 }
 
-                read_lock(&ls->ls_rsbtbl[bucket].lock);
+                spin_lock(&ls->ls_rsbtbl[bucket].lock);
                 if (!list_empty(&ls->ls_rsbtbl[bucket].list)) {
                         r = list_first_entry(&ls->ls_rsbtbl[bucket].list,
                                              struct dlm_rsb, res_hashchain);
                         dlm_hold_rsb(r);
                         ri->rsb = r;
                         ri->bucket = bucket;
-                        read_unlock(&ls->ls_rsbtbl[bucket].lock);
+                        spin_unlock(&ls->ls_rsbtbl[bucket].lock);
                         *pos = n;
                         return ri;
                 }
-                read_unlock(&ls->ls_rsbtbl[bucket].lock);
+                spin_unlock(&ls->ls_rsbtbl[bucket].lock);
         }
 }
 
@@ -477,7 +477,7 @@ static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos)
          * move to the next rsb in the same bucket
          */
 
-        read_lock(&ls->ls_rsbtbl[bucket].lock);
+        spin_lock(&ls->ls_rsbtbl[bucket].lock);
         rp = ri->rsb;
         next = rp->res_hashchain.next;
 
@@ -485,12 +485,12 @@ static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos)
                 r = list_entry(next, struct dlm_rsb, res_hashchain);
                 dlm_hold_rsb(r);
                 ri->rsb = r;
-                read_unlock(&ls->ls_rsbtbl[bucket].lock);
+                spin_unlock(&ls->ls_rsbtbl[bucket].lock);
                 dlm_put_rsb(rp);
                 ++*pos;
                 return ri;
         }
-        read_unlock(&ls->ls_rsbtbl[bucket].lock);
+        spin_unlock(&ls->ls_rsbtbl[bucket].lock);
         dlm_put_rsb(rp);
 
         /*
@@ -509,18 +509,18 @@ static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos)
                         return NULL;
                 }
 
-                read_lock(&ls->ls_rsbtbl[bucket].lock);
+                spin_lock(&ls->ls_rsbtbl[bucket].lock);
                 if (!list_empty(&ls->ls_rsbtbl[bucket].list)) {
                         r = list_first_entry(&ls->ls_rsbtbl[bucket].list,
                                              struct dlm_rsb, res_hashchain);
                         dlm_hold_rsb(r);
                         ri->rsb = r;
                         ri->bucket = bucket;
-                        read_unlock(&ls->ls_rsbtbl[bucket].lock);
+                        spin_unlock(&ls->ls_rsbtbl[bucket].lock);
                         *pos = n;
                         return ri;
                 }
-                read_unlock(&ls->ls_rsbtbl[bucket].lock);
+                spin_unlock(&ls->ls_rsbtbl[bucket].lock);
         }
 }