/**
* eblob_l2hash_remove_nolock() - remove l2hash entry specified by @key
*
* Returns:
* 0: @key removed
* -ENOENT: @key not found
* Other: Error
*/
static int eblob_l2hash_remove_nolock(struct eblob_l2hash *l2h,
struct eblob_key *key)
{
struct eblob_l2hash_collision *collision;
struct eblob_l2hash_entry *e;
int err;
assert(l2h != NULL);
assert(key != NULL);
assert(pthread_mutex_trylock(&l2h->root_lock) == EBUSY);
/* Find entry in tree */
if ((e = __eblob_l2hash_lookup(l2h, key)) == NULL)
return -ENOENT;
/*
* If there are no collisions check that key belongs to rctl and
* remove entry from tree
*/
if (e->collision == 0) {
switch(err = eblob_l2hash_compare_index(key, &e->rctl)) {
case 0:
rb_erase(&e->node, &l2h->root);
free(e);
return 0;
case 1:
return -ENOENT;
default:
return err;
}
}
/* If collision is set and entry is not present in collision tree */
collision = __eblob_l2hash_resolve_collision(&l2h->collisions, key);
if (collision == NULL)
return -ENOENT;
/* Otherwise - remove entry from collision tree */
rb_erase(&collision->node, &l2h->collisions);
free(collision);
return 0;
}
/**
* eblob_l2hash_resolve_collision() - resolves possible collision in l2hash by
* going to disk or walking collision tree.
*
* Returns:
* 0: @key resolved into @rctl
* -ENOENT: @key not found
* Other: Error
*/
static int eblob_l2hash_resolve_collision(struct rb_root *root,
struct eblob_l2hash_entry *e,
const struct eblob_key *key,
struct eblob_ram_control *rctl)
{
struct eblob_l2hash_collision *collision;
int err;
assert(root != NULL);
assert(e != NULL);
assert(key != NULL);
assert(rctl != NULL);
/*
* No collision detected so just check that key really belongs
* to cached ram control.
*/
if (e->collision == 0) {
switch((err = eblob_l2hash_compare_index(key, &e->rctl))) {
case 0:
*rctl = e->rctl;
return 0;
case 1:
return -ENOENT;
default:
return err;
}
/* NOT REACHED */
}
/*
* If there is collision then we should look in collision tree.
*/
if ((collision = __eblob_l2hash_resolve_collision(root, key)) == NULL)
return -ENOENT;
*rctl = collision->rctl;
return 0;
}
