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dlm: change rsbtbl rwlock to spinlock

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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>
This commit is contained in:
David Teigland
2009-01-07 16:50:41 -06:00
parent 892c4467e3
commit c7be761a81
5 changed files with 32 additions and 32 deletions
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24
fs/dlm/debug_fs.c
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@@ -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);
}
}