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Commit 1d7c484e authored by David Teigland's avatar David Teigland
Browse files

dlm: use idr instead of list for recovered rsbs 



When a large number of resources are being recovered,
a linear search of the recover_list takes a long time.
Use an idr in place of a list.

Signed-off-by: default avatarDavid Teigland <teigland@redhat.com>
parent c04fecb4

fs/dlm/dlm_internal.h

+3 −0
Original line number Diff line number Diff line
@@ -288,6 +288,7 @@ struct dlm_rsb { 
	int			res_nodeid;

	int			res_master_nodeid;

	int			res_dir_nodeid;

	int			res_id;		/* for ls_recover_idr */

	uint32_t                res_lvbseq;

	uint32_t		res_hash;

	uint32_t		res_bucket;	/* rsbtbl */
@@ -587,6 +588,8 @@ struct dlm_ls { 
	struct list_head	ls_recover_list;

	spinlock_t		ls_recover_list_lock;

	int			ls_recover_list_count;

	struct idr		ls_recover_idr;

	spinlock_t		ls_recover_idr_lock;

	wait_queue_head_t	ls_wait_general;

	struct mutex		ls_clear_proc_locks;

fs/dlm/lockspace.c

+3 −0
Original line number Diff line number Diff line
@@ -565,6 +565,8 @@ static int new_lockspace(const char *name, const char *cluster, 


	INIT_LIST_HEAD(&ls->ls_recover_list);

	spin_lock_init(&ls->ls_recover_list_lock);

	idr_init(&ls->ls_recover_idr);

	spin_lock_init(&ls->ls_recover_idr_lock);

	ls->ls_recover_list_count = 0;

	ls->ls_local_handle = ls;

	init_waitqueue_head(&ls->ls_wait_general);
@@ -636,6 +638,7 @@ static int new_lockspace(const char *name, const char *cluster, 
	spin_lock(&lslist_lock);

	list_del(&ls->ls_list);

	spin_unlock(&lslist_lock);

	idr_destroy(&ls->ls_recover_idr);

	kfree(ls->ls_recover_buf);

 out_lkbfree:

	idr_destroy(&ls->ls_lkbidr);

fs/dlm/rcom.c

+1 −1
Original line number Diff line number Diff line
@@ -325,7 +325,7 @@ int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid) 
	if (error)

		goto out;

	memcpy(rc->rc_buf, r->res_name, r->res_length);

	rc->rc_id = (unsigned long) r;

	rc->rc_id = (unsigned long) r->res_id;



	send_rcom(ls, mh, rc);

 out:

fs/dlm/recover.c

+94 −22
Original line number Diff line number Diff line
@@ -277,40 +277,112 @@ static void recover_list_del(struct dlm_rsb *r) 
	dlm_put_rsb(r);

}



static struct dlm_rsb *recover_list_find(struct dlm_ls *ls, uint64_t id)

static void recover_list_clear(struct dlm_ls *ls)

{

	struct dlm_rsb *r = NULL;

	struct dlm_rsb *r, *s;



	spin_lock(&ls->ls_recover_list_lock);

	list_for_each_entry_safe(r, s, &ls->ls_recover_list, res_recover_list) {

		list_del_init(&r->res_recover_list);

		r->res_recover_locks_count = 0;

		dlm_put_rsb(r);

		ls->ls_recover_list_count--;

	}



	list_for_each_entry(r, &ls->ls_recover_list, res_recover_list) {

		if (id == (unsigned long) r)

			goto out;

	if (ls->ls_recover_list_count != 0) {

		log_error(ls, "warning: recover_list_count %d",

			  ls->ls_recover_list_count);

		ls->ls_recover_list_count = 0;

	}

	r = NULL;

 out:

	spin_unlock(&ls->ls_recover_list_lock);

}



static int recover_idr_empty(struct dlm_ls *ls)

{

	int empty = 1;



	spin_lock(&ls->ls_recover_idr_lock);

	if (ls->ls_recover_list_count)

		empty = 0;

	spin_unlock(&ls->ls_recover_idr_lock);



	return empty;

}



static int recover_idr_add(struct dlm_rsb *r)

{

	struct dlm_ls *ls = r->res_ls;

	int rv, id;



	rv = idr_pre_get(&ls->ls_recover_idr, GFP_NOFS);

	if (!rv)

		return -ENOMEM;



	spin_lock(&ls->ls_recover_idr_lock);

	if (r->res_id) {

		spin_unlock(&ls->ls_recover_idr_lock);

		return -1;

	}

	rv = idr_get_new_above(&ls->ls_recover_idr, r, 1, &id);

	if (rv) {

		spin_unlock(&ls->ls_recover_idr_lock);

		return rv;

	}

	r->res_id = id;

	ls->ls_recover_list_count++;

	dlm_hold_rsb(r);

	spin_unlock(&ls->ls_recover_idr_lock);

	return 0;

}



static void recover_idr_del(struct dlm_rsb *r)

{

	struct dlm_ls *ls = r->res_ls;



	spin_lock(&ls->ls_recover_idr_lock);

	idr_remove(&ls->ls_recover_idr, r->res_id);

	r->res_id = 0;

	ls->ls_recover_list_count--;

	spin_unlock(&ls->ls_recover_idr_lock);



	dlm_put_rsb(r);

}



static struct dlm_rsb *recover_idr_find(struct dlm_ls *ls, uint64_t id)

{

	struct dlm_rsb *r;



	spin_lock(&ls->ls_recover_idr_lock);

	r = idr_find(&ls->ls_recover_idr, (int)id);

	spin_unlock(&ls->ls_recover_idr_lock);

	return r;

}



static void recover_list_clear(struct dlm_ls *ls)

static int recover_idr_clear_rsb(int id, void *p, void *data)

{

	struct dlm_rsb *r, *s;

	struct dlm_ls *ls = data;

	struct dlm_rsb *r = p;



	spin_lock(&ls->ls_recover_list_lock);

	list_for_each_entry_safe(r, s, &ls->ls_recover_list, res_recover_list) {

		list_del_init(&r->res_recover_list);

	r->res_id = 0;

	r->res_recover_locks_count = 0;

		dlm_put_rsb(r);

	ls->ls_recover_list_count--;



	dlm_put_rsb(r);

	return 0;

}



static void recover_idr_clear(struct dlm_ls *ls)

{

	spin_lock(&ls->ls_recover_idr_lock);

	idr_for_each(&ls->ls_recover_idr, recover_idr_clear_rsb, ls);

	idr_remove_all(&ls->ls_recover_idr);



	if (ls->ls_recover_list_count != 0) {

		log_error(ls, "warning: recover_list_count %d",

			  ls->ls_recover_list_count);

		ls->ls_recover_list_count = 0;

	}

	spin_unlock(&ls->ls_recover_list_lock);

	spin_unlock(&ls->ls_recover_idr_lock);

}
@@ -408,7 +480,7 @@ static int recover_master(struct dlm_rsb *r, unsigned int *count) 
		set_new_master(r);

		error = 0;

	} else {

		recover_list_add(r);

		recover_idr_add(r);

		error = dlm_send_rcom_lookup(r, dir_nodeid);

	}
@@ -493,10 +565,10 @@ int dlm_recover_masters(struct dlm_ls *ls) 


	log_debug(ls, "dlm_recover_masters %u of %u", count, total);



	error = dlm_wait_function(ls, &recover_list_empty);

	error = dlm_wait_function(ls, &recover_idr_empty);

 out:

	if (error)

		recover_list_clear(ls);

		recover_idr_clear(ls);

	return error;

}
@@ -505,7 +577,7 @@ int dlm_recover_master_reply(struct dlm_ls *ls, struct dlm_rcom *rc) 
	struct dlm_rsb *r;

	int ret_nodeid, new_master;



	r = recover_list_find(ls, rc->rc_id);

	r = recover_idr_find(ls, rc->rc_id);

	if (!r) {

		log_error(ls, "dlm_recover_master_reply no id %llx",

			  (unsigned long long)rc->rc_id);
@@ -524,9 +596,9 @@ int dlm_recover_master_reply(struct dlm_ls *ls, struct dlm_rcom *rc) 
	r->res_nodeid = new_master;

	set_new_master(r);

	unlock_rsb(r);

	recover_list_del(r);

	recover_idr_del(r);



	if (recover_list_empty(ls))

	if (recover_idr_empty(ls))

		wake_up(&ls->ls_wait_general);

 out:

	return 0;