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); }