diff options
Diffstat (limited to 'drivers/staging/zcache/tmem.c')
-rw-r--r-- | drivers/staging/zcache/tmem.c | 102 |
1 files changed, 81 insertions, 21 deletions
diff --git a/drivers/staging/zcache/tmem.c b/drivers/staging/zcache/tmem.c index e954d40..1ca66ea 100644 --- a/drivers/staging/zcache/tmem.c +++ b/drivers/staging/zcache/tmem.c @@ -142,6 +142,7 @@ static void tmem_obj_init(struct tmem_obj *obj, struct tmem_hashbucket *hb, obj->oid = *oidp; obj->objnode_count = 0; obj->pampd_count = 0; + (*tmem_pamops.new_obj)(obj); SET_SENTINEL(obj, OBJ); while (*new) { BUG_ON(RB_EMPTY_NODE(*new)); @@ -274,7 +275,7 @@ static void tmem_objnode_free(struct tmem_objnode *objnode) /* * lookup index in object and return associated pampd (or NULL if not found) */ -static void *tmem_pampd_lookup_in_obj(struct tmem_obj *obj, uint32_t index) +static void **__tmem_pampd_lookup_in_obj(struct tmem_obj *obj, uint32_t index) { unsigned int height, shift; struct tmem_objnode **slot = NULL; @@ -303,9 +304,33 @@ static void *tmem_pampd_lookup_in_obj(struct tmem_obj *obj, uint32_t index) height--; } out: + return slot != NULL ? (void **)slot : NULL; +} + +static void *tmem_pampd_lookup_in_obj(struct tmem_obj *obj, uint32_t index) +{ + struct tmem_objnode **slot; + + slot = (struct tmem_objnode **)__tmem_pampd_lookup_in_obj(obj, index); return slot != NULL ? *slot : NULL; } +static void *tmem_pampd_replace_in_obj(struct tmem_obj *obj, uint32_t index, + void *new_pampd) +{ + struct tmem_objnode **slot; + void *ret = NULL; + + slot = (struct tmem_objnode **)__tmem_pampd_lookup_in_obj(obj, index); + if ((slot != NULL) && (*slot != NULL)) { + void *old_pampd = *(void **)slot; + *(void **)slot = new_pampd; + (*tmem_pamops.free)(old_pampd, obj->pool, NULL, 0); + ret = new_pampd; + } + return ret; +} + static int tmem_pampd_add_to_obj(struct tmem_obj *obj, uint32_t index, void *pampd) { @@ -456,7 +481,7 @@ static void tmem_objnode_node_destroy(struct tmem_obj *obj, if (ht == 1) { obj->pampd_count--; (*tmem_pamops.free)(objnode->slots[i], - obj->pool); + obj->pool, NULL, 0); objnode->slots[i] = NULL; continue; } @@ -473,7 +498,7 @@ static void tmem_pampd_destroy_all_in_obj(struct tmem_obj *obj) return; if (obj->objnode_tree_height == 0) { obj->pampd_count--; - (*tmem_pamops.free)(obj->objnode_tree_root, obj->pool); + (*tmem_pamops.free)(obj->objnode_tree_root, obj->pool, NULL, 0); } else { tmem_objnode_node_destroy(obj, obj->objnode_tree_root, obj->objnode_tree_height); @@ -481,6 +506,7 @@ static void tmem_pampd_destroy_all_in_obj(struct tmem_obj *obj) obj->objnode_tree_height = 0; } obj->objnode_tree_root = NULL; + (*tmem_pamops.free_obj)(obj->pool, obj); } /* @@ -503,15 +529,13 @@ static void tmem_pampd_destroy_all_in_obj(struct tmem_obj *obj) * always flushes for simplicity. */ int tmem_put(struct tmem_pool *pool, struct tmem_oid *oidp, uint32_t index, - struct page *page) + char *data, size_t size, bool raw, bool ephemeral) { struct tmem_obj *obj = NULL, *objfound = NULL, *objnew = NULL; void *pampd = NULL, *pampd_del = NULL; int ret = -ENOMEM; - bool ephemeral; struct tmem_hashbucket *hb; - ephemeral = is_ephemeral(pool); hb = &pool->hashbucket[tmem_oid_hash(oidp)]; spin_lock(&hb->lock); obj = objfound = tmem_obj_find(hb, oidp); @@ -521,7 +545,7 @@ int tmem_put(struct tmem_pool *pool, struct tmem_oid *oidp, uint32_t index, /* if found, is a dup put, flush the old one */ pampd_del = tmem_pampd_delete_from_obj(obj, index); BUG_ON(pampd_del != pampd); - (*tmem_pamops.free)(pampd, pool); + (*tmem_pamops.free)(pampd, pool, oidp, index); if (obj->pampd_count == 0) { objnew = obj; objfound = NULL; @@ -538,7 +562,8 @@ int tmem_put(struct tmem_pool *pool, struct tmem_oid *oidp, uint32_t index, } BUG_ON(obj == NULL); BUG_ON(((objnew != obj) && (objfound != obj)) || (objnew == objfound)); - pampd = (*tmem_pamops.create)(obj->pool, &obj->oid, index, page); + pampd = (*tmem_pamops.create)(data, size, raw, ephemeral, + obj->pool, &obj->oid, index); if (unlikely(pampd == NULL)) goto free; ret = tmem_pampd_add_to_obj(obj, index, pampd); @@ -551,7 +576,7 @@ delete_and_free: (void)tmem_pampd_delete_from_obj(obj, index); free: if (pampd) - (*tmem_pamops.free)(pampd, pool); + (*tmem_pamops.free)(pampd, pool, NULL, 0); if (objnew) { tmem_obj_free(objnew, hb); (*tmem_hostops.obj_free)(objnew, pool); @@ -573,41 +598,52 @@ out: * "put" done with the same handle). */ -int tmem_get(struct tmem_pool *pool, struct tmem_oid *oidp, - uint32_t index, struct page *page) +int tmem_get(struct tmem_pool *pool, struct tmem_oid *oidp, uint32_t index, + char *data, size_t *size, bool raw, int get_and_free) { struct tmem_obj *obj; void *pampd; bool ephemeral = is_ephemeral(pool); - uint32_t ret = -1; + int ret = -1; struct tmem_hashbucket *hb; + bool free = (get_and_free == 1) || ((get_and_free == 0) && ephemeral); + bool lock_held = false; hb = &pool->hashbucket[tmem_oid_hash(oidp)]; spin_lock(&hb->lock); + lock_held = true; obj = tmem_obj_find(hb, oidp); if (obj == NULL) goto out; - ephemeral = is_ephemeral(pool); - if (ephemeral) + if (free) pampd = tmem_pampd_delete_from_obj(obj, index); else pampd = tmem_pampd_lookup_in_obj(obj, index); if (pampd == NULL) goto out; - ret = (*tmem_pamops.get_data)(page, pampd, pool); - if (ret < 0) - goto out; - if (ephemeral) { - (*tmem_pamops.free)(pampd, pool); + if (free) { if (obj->pampd_count == 0) { tmem_obj_free(obj, hb); (*tmem_hostops.obj_free)(obj, pool); obj = NULL; } } + if (tmem_pamops.is_remote(pampd)) { + lock_held = false; + spin_unlock(&hb->lock); + } + if (free) + ret = (*tmem_pamops.get_data_and_free)( + data, size, raw, pampd, pool, oidp, index); + else + ret = (*tmem_pamops.get_data)( + data, size, raw, pampd, pool, oidp, index); + if (ret < 0) + goto out; ret = 0; out: - spin_unlock(&hb->lock); + if (lock_held) + spin_unlock(&hb->lock); return ret; } @@ -632,7 +668,7 @@ int tmem_flush_page(struct tmem_pool *pool, pampd = tmem_pampd_delete_from_obj(obj, index); if (pampd == NULL) goto out; - (*tmem_pamops.free)(pampd, pool); + (*tmem_pamops.free)(pampd, pool, oidp, index); if (obj->pampd_count == 0) { tmem_obj_free(obj, hb); (*tmem_hostops.obj_free)(obj, pool); @@ -645,6 +681,30 @@ out: } /* + * If a page in tmem matches the handle, replace the page so that any + * subsequent "get" gets the new page. Returns 0 if + * there was a page to replace, else returns -1. + */ +int tmem_replace(struct tmem_pool *pool, struct tmem_oid *oidp, + uint32_t index, void *new_pampd) +{ + struct tmem_obj *obj; + int ret = -1; + struct tmem_hashbucket *hb; + + hb = &pool->hashbucket[tmem_oid_hash(oidp)]; + spin_lock(&hb->lock); + obj = tmem_obj_find(hb, oidp); + if (obj == NULL) + goto out; + new_pampd = tmem_pampd_replace_in_obj(obj, index, new_pampd); + ret = (*tmem_pamops.replace_in_obj)(new_pampd, obj); +out: + spin_unlock(&hb->lock); + return ret; +} + +/* * "Flush" all pages in tmem matching this oid. */ int tmem_flush_object(struct tmem_pool *pool, struct tmem_oid *oidp) |