From 81f2094a631df1ba275f4d4bd7ea5bacfd8dbcfc Mon Sep 17 00:00:00 2001 From: Mark Fasheh Date: Tue, 28 Feb 2006 17:31:22 -0800 Subject: [PATCH] ocfs2: use hlists for lockres hash Switch from list_head to hlist_head. Make the size of the hash dependent upon the allocated area, rather than a constant. Signed-off-by: Mark Fasheh --- fs/ocfs2/dlm/dlmdomain.c | 39 +++++++++++++++++++-------------------- 1 file changed, 19 insertions(+), 20 deletions(-) (limited to 'fs/ocfs2/dlm/dlmdomain.c') diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c index 6ee30837389..8f3a9e3106f 100644 --- a/fs/ocfs2/dlm/dlmdomain.c +++ b/fs/ocfs2/dlm/dlmdomain.c @@ -77,26 +77,26 @@ static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm); void __dlm_unhash_lockres(struct dlm_lock_resource *lockres) { - list_del_init(&lockres->list); + hlist_del_init(&lockres->hash_node); dlm_lockres_put(lockres); } void __dlm_insert_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res) { - struct list_head *bucket; + struct hlist_head *bucket; struct qstr *q; assert_spin_locked(&dlm->spinlock); q = &res->lockname; q->hash = full_name_hash(q->name, q->len); - bucket = &(dlm->resources[q->hash & DLM_HASH_MASK]); + bucket = &(dlm->lockres_hash[q->hash % DLM_HASH_BUCKETS]); /* get a reference for our hashtable */ dlm_lockres_get(res); - list_add_tail(&res->list, bucket); + hlist_add_head(&res->hash_node, bucket); } struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm, @@ -104,9 +104,9 @@ struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm, unsigned int len) { unsigned int hash; - struct list_head *iter; + struct hlist_node *iter; struct dlm_lock_resource *tmpres=NULL; - struct list_head *bucket; + struct hlist_head *bucket; mlog_entry("%.*s\n", len, name); @@ -114,11 +114,11 @@ struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm, hash = full_name_hash(name, len); - bucket = &(dlm->resources[hash & DLM_HASH_MASK]); + bucket = &(dlm->lockres_hash[hash % DLM_HASH_BUCKETS]); /* check for pre-existing lock */ - list_for_each(iter, bucket) { - tmpres = list_entry(iter, struct dlm_lock_resource, list); + hlist_for_each(iter, bucket) { + tmpres = hlist_entry(iter, struct dlm_lock_resource, hash_node); if (tmpres->lockname.len == len && memcmp(tmpres->lockname.name, name, len) == 0) { dlm_lockres_get(tmpres); @@ -193,8 +193,8 @@ static int dlm_wait_on_domain_helper(const char *domain) static void dlm_free_ctxt_mem(struct dlm_ctxt *dlm) { - if (dlm->resources) - free_page((unsigned long) dlm->resources); + if (dlm->lockres_hash) + free_page((unsigned long) dlm->lockres_hash); if (dlm->name) kfree(dlm->name); @@ -303,10 +303,10 @@ static void dlm_migrate_all_locks(struct dlm_ctxt *dlm) mlog(0, "Migrating locks from domain %s\n", dlm->name); restart: spin_lock(&dlm->spinlock); - for (i=0; iresources[i])) { - res = list_entry(dlm->resources[i].next, - struct dlm_lock_resource, list); + for (i = 0; i < DLM_HASH_BUCKETS; i++) { + while (!hlist_empty(&dlm->lockres_hash[i])) { + res = hlist_entry(dlm->lockres_hash[i].first, + struct dlm_lock_resource, hash_node); /* need reference when manually grabbing lockres */ dlm_lockres_get(res); /* this should unhash the lockres @@ -1191,18 +1191,17 @@ static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain, goto leave; } - dlm->resources = (struct list_head *) __get_free_page(GFP_KERNEL); - if (!dlm->resources) { + dlm->lockres_hash = (struct hlist_head *) __get_free_page(GFP_KERNEL); + if (!dlm->lockres_hash) { mlog_errno(-ENOMEM); kfree(dlm->name); kfree(dlm); dlm = NULL; goto leave; } - memset(dlm->resources, 0, PAGE_SIZE); - for (i=0; iresources[i]); + for (i=0; ilockres_hash[i]); strcpy(dlm->name, domain); dlm->key = key; -- cgit v1.2.3