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Commit c7be761a authored by David Teigland's avatar David Teigland
Browse files

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: default avatarDavid Teigland <teigland@redhat.com>
parent 892c4467

fs/dlm/debug_fs.c

+12 −12
Original line number Diff line number Diff line
@@ -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);

	}

}

fs/dlm/dlm_internal.h

+1 −1
Original line number Diff line number Diff line
@@ -105,7 +105,7 @@ struct dlm_dirtable { 
struct dlm_rsbtable {

	struct list_head	list;

	struct list_head	toss;

	rwlock_t		lock;

	spinlock_t		lock;

};



struct dlm_lkbtable {

fs/dlm/lock.c

+13 −13
Original line number Diff line number Diff line
@@ -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;

}

fs/dlm/lockspace.c

+1 −1
Original line number Diff line number Diff line
@@ -464,7 +464,7 @@ static int new_lockspace(char *name, int namelen, void **lockspace, 
	for (i = 0; i < size; i++) {

		INIT_LIST_HEAD(&ls->ls_rsbtbl[i].list);

		INIT_LIST_HEAD(&ls->ls_rsbtbl[i].toss);

		rwlock_init(&ls->ls_rsbtbl[i].lock);

		spin_lock_init(&ls->ls_rsbtbl[i].lock);

	}



	size = dlm_config.ci_lkbtbl_size;

fs/dlm/recover.c

+5 −5
Original line number Diff line number Diff line
@@ -726,7 +726,7 @@ int dlm_create_root_list(struct dlm_ls *ls) 
	}



	for (i = 0; i < ls->ls_rsbtbl_size; i++) {

		read_lock(&ls->ls_rsbtbl[i].lock);

		spin_lock(&ls->ls_rsbtbl[i].lock);

		list_for_each_entry(r, &ls->ls_rsbtbl[i].list, res_hashchain) {

			list_add(&r->res_root_list, &ls->ls_root_list);

			dlm_hold_rsb(r);
@@ -737,7 +737,7 @@ int dlm_create_root_list(struct dlm_ls *ls) 
		   but no other recovery steps should do anything with them. */



		if (dlm_no_directory(ls)) {

			read_unlock(&ls->ls_rsbtbl[i].lock);

			spin_unlock(&ls->ls_rsbtbl[i].lock);

			continue;

		}
@@ -745,7 +745,7 @@ int dlm_create_root_list(struct dlm_ls *ls) 
			list_add(&r->res_root_list, &ls->ls_root_list);

			dlm_hold_rsb(r);

		}

		read_unlock(&ls->ls_rsbtbl[i].lock);

		spin_unlock(&ls->ls_rsbtbl[i].lock);

	}

 out:

	up_write(&ls->ls_root_sem);
@@ -775,7 +775,7 @@ void dlm_clear_toss_list(struct dlm_ls *ls) 
	int i;



	for (i = 0; i < ls->ls_rsbtbl_size; i++) {

		write_lock(&ls->ls_rsbtbl[i].lock);

		spin_lock(&ls->ls_rsbtbl[i].lock);

		list_for_each_entry_safe(r, safe, &ls->ls_rsbtbl[i].toss,

					 res_hashchain) {

			if (dlm_no_directory(ls) || !is_master(r)) {
@@ -783,7 +783,7 @@ void dlm_clear_toss_list(struct dlm_ls *ls) 
				dlm_free_rsb(r);

			}

		}

		write_unlock(&ls->ls_rsbtbl[i].lock);

		spin_unlock(&ls->ls_rsbtbl[i].lock);

	}

}