static void sss_mc_invalidate_rec(struct sss_mc_ctx *mcc,
struct sss_mc_rec *rec)
{
if (rec->b1 == MC_INVALID_VAL) {
/* record already invalid */
return;
}
/* Remove from hash chains */
/* hash chain 1 */
sss_mc_rm_rec_from_chain(mcc, rec, rec->hash1);
/* hash chain 2 */
sss_mc_rm_rec_from_chain(mcc, rec, rec->hash2);
/* Clear from free_table */
sss_mc_free_slots(mcc, rec);
/* Invalidate record fields */
MC_RAISE_INVALID_BARRIER(rec);
memset(rec->data, MC_INVALID_VAL8, ((MC_SLOT_SIZE * MC_SIZE_TO_SLOTS(rec->len))
- sizeof(struct sss_mc_rec)));
rec->len = MC_INVALID_VAL32;
rec->expire = MC_INVALID_VAL64;
rec->next = MC_INVALID_VAL32;
rec->hash1 = MC_INVALID_VAL32;
rec->hash2 = MC_INVALID_VAL32;
MC_LOWER_BARRIER(rec);
}
static struct sss_mc_rec *sss_mc_get_record(struct sss_mc_ctx *mcc,
size_t rec_len,
struct sized_string *key)
{
struct sss_mc_rec *old_rec = NULL;
struct sss_mc_rec *rec;
int old_slots;
int num_slots;
uint32_t base_slot;
int i;
num_slots = MC_SIZE_TO_SLOTS(rec_len);
old_rec = sss_mc_find_record(mcc, key);
if (old_rec) {
old_slots = MC_SIZE_TO_SLOTS(old_rec->len);
if (old_slots == num_slots) {
return old_rec;
}
/* slot size changed, invalidate record and fall through to get a
* fully new record */
base_slot = MC_PTR_TO_SLOT(mcc->data_table, old_rec);
sss_mc_invalidate_rec(mcc, old_rec);
/* and now free slots */
for (i = 0; i < old_slots; i++) {
MC_CLEAR_BIT(mcc->free_table, base_slot + i);
}
}
/* we are going to use more space, find enough free slots */
base_slot = sss_mc_find_free_slots(mcc, num_slots);
rec = MC_SLOT_TO_PTR(mcc->data_table, base_slot, struct sss_mc_rec);
/* mark as not valid yet */
MC_RAISE_INVALID_BARRIER(rec);
rec->len = rec_len;
rec->next = MC_INVALID_VAL;
MC_LOWER_BARRIER(rec);
/* and now mark slots as used */
for (i = 0; i < num_slots; i++) {
MC_SET_BIT(mcc->free_table, base_slot + i);
}
return rec;
}
static void sss_mc_invalidate_rec(struct sss_mc_ctx *mcc,
struct sss_mc_rec *rec)
{
if (rec->b1 == MC_INVALID_VAL) {
/* record already invalid */
return;
}
/* hash chain 1 */
sss_mc_rm_rec_from_chain(mcc, rec, rec->hash1);
/* hash chain 2 */
sss_mc_rm_rec_from_chain(mcc, rec, rec->hash2);
MC_RAISE_INVALID_BARRIER(rec);
memset(rec->data, 'X', rec->len - sizeof(struct sss_mc_rec));
rec->len = MC_INVALID_VAL;
rec->expire = (uint64_t)-1;
rec->next = MC_INVALID_VAL;
rec->hash1 = MC_INVALID_VAL;
rec->hash2 = MC_INVALID_VAL;
MC_LOWER_BARRIER(rec);
}
