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authorDavid Teigland <teigland@redhat.com>2009-01-07 16:50:41 -0600
committerDavid Teigland <teigland@redhat.com>2009-01-08 15:12:39 -0600
commitc7be761a8163d2f1ac0b606c21e4316b7abc5af7 (patch)
tree1687373b56379c1c310f43b1c05ac486c67dec48 /fs/dlm/lock.c
parent892c4467e335e9050c95e0d8409c136c4dadaca2 (diff)
downloadlinux-linaro-stable-c7be761a8163d2f1ac0b606c21e4316b7abc5af7.tar.gz
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>
Diffstat (limited to 'fs/dlm/lock.c')
-rw-r--r--fs/dlm/lock.c26
1 files changed, 13 insertions, 13 deletions
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 6cfe65bbf4a2..01e7d39c5fba 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -412,9 +412,9 @@ static int search_rsb(struct dlm_ls *ls, char *name, int len, int b,
unsigned int flags, struct dlm_rsb **r_ret)
{
int error;
- write_lock(&ls->ls_rsbtbl[b].lock);
+ spin_lock(&ls->ls_rsbtbl[b].lock);
error = _search_rsb(ls, name, len, b, flags, r_ret);
- write_unlock(&ls->ls_rsbtbl[b].lock);
+ spin_unlock(&ls->ls_rsbtbl[b].lock);
return error;
}
@@ -478,16 +478,16 @@ static int find_rsb(struct dlm_ls *ls, char *name, int namelen,
r->res_nodeid = nodeid;
}
- write_lock(&ls->ls_rsbtbl[bucket].lock);
+ spin_lock(&ls->ls_rsbtbl[bucket].lock);
error = _search_rsb(ls, name, namelen, bucket, 0, &tmp);
if (!error) {
- write_unlock(&ls->ls_rsbtbl[bucket].lock);
+ spin_unlock(&ls->ls_rsbtbl[bucket].lock);
dlm_free_rsb(r);
r = tmp;
goto out;
}
list_add(&r->res_hashchain, &ls->ls_rsbtbl[bucket].list);
- write_unlock(&ls->ls_rsbtbl[bucket].lock);
+ spin_unlock(&ls->ls_rsbtbl[bucket].lock);
error = 0;
out:
*r_ret = r;
@@ -530,9 +530,9 @@ static void put_rsb(struct dlm_rsb *r)
struct dlm_ls *ls = r->res_ls;
uint32_t bucket = r->res_bucket;
- write_lock(&ls->ls_rsbtbl[bucket].lock);
+ spin_lock(&ls->ls_rsbtbl[bucket].lock);
kref_put(&r->res_ref, toss_rsb);
- write_unlock(&ls->ls_rsbtbl[bucket].lock);
+ spin_unlock(&ls->ls_rsbtbl[bucket].lock);
}
void dlm_put_rsb(struct dlm_rsb *r)
@@ -967,7 +967,7 @@ static int shrink_bucket(struct dlm_ls *ls, int b)
for (;;) {
found = 0;
- write_lock(&ls->ls_rsbtbl[b].lock);
+ spin_lock(&ls->ls_rsbtbl[b].lock);
list_for_each_entry_reverse(r, &ls->ls_rsbtbl[b].toss,
res_hashchain) {
if (!time_after_eq(jiffies, r->res_toss_time +
@@ -978,20 +978,20 @@ static int shrink_bucket(struct dlm_ls *ls, int b)
}
if (!found) {
- write_unlock(&ls->ls_rsbtbl[b].lock);
+ spin_unlock(&ls->ls_rsbtbl[b].lock);
break;
}
if (kref_put(&r->res_ref, kill_rsb)) {
list_del(&r->res_hashchain);
- write_unlock(&ls->ls_rsbtbl[b].lock);
+ spin_unlock(&ls->ls_rsbtbl[b].lock);
if (is_master(r))
dir_remove(r);
dlm_free_rsb(r);
count++;
} else {
- write_unlock(&ls->ls_rsbtbl[b].lock);
+ spin_unlock(&ls->ls_rsbtbl[b].lock);
log_error(ls, "tossed rsb in use %s", r->res_name);
}
}
@@ -4224,7 +4224,7 @@ static struct dlm_rsb *find_purged_rsb(struct dlm_ls *ls, int bucket)
{
struct dlm_rsb *r, *r_ret = NULL;
- read_lock(&ls->ls_rsbtbl[bucket].lock);
+ spin_lock(&ls->ls_rsbtbl[bucket].lock);
list_for_each_entry(r, &ls->ls_rsbtbl[bucket].list, res_hashchain) {
if (!rsb_flag(r, RSB_LOCKS_PURGED))
continue;
@@ -4233,7 +4233,7 @@ static struct dlm_rsb *find_purged_rsb(struct dlm_ls *ls, int bucket)
r_ret = r;
break;
}
- read_unlock(&ls->ls_rsbtbl[bucket].lock);
+ spin_unlock(&ls->ls_rsbtbl[bucket].lock);
return r_ret;
}