fsal_acl_t *nfs4_acl_new_entry(fsal_acl_data_t *acldata,
fsal_acl_status_t *status)
{
fsal_acl_t *acl = NULL;
struct gsh_buffdesc key;
struct gsh_buffdesc value;
int rc;
struct hash_latch latch;
/* Set the return default to NFS_V4_ACL_SUCCESS */
*status = NFS_V4_ACL_SUCCESS;
key.addr = acldata->aces;
key.len = acldata->naces * sizeof(fsal_ace_t);
/* Check if the entry already exists */
rc = hashtable_getlatch(fsal_acl_hash, &key, &value, true, &latch);
if (rc == HASHTABLE_SUCCESS) {
/* Entry is already in the cache, do not add it */
acl = value.addr;
*status = NFS_V4_ACL_EXISTS;
nfs4_ace_free(acldata->aces);
nfs4_acl_entry_inc_ref(acl);
hashtable_releaselatched(fsal_acl_hash, &latch);
return acl;
}
/* Any other result other than no such key is an error */
if (rc != HASHTABLE_ERROR_NO_SUCH_KEY) {
*status = NFS_V4_ACL_INIT_ENTRY_FAILED;
nfs4_ace_free(acldata->aces);
return NULL;
}
/* Adding the entry in the cache */
acl = nfs4_acl_alloc();
if (pthread_rwlock_init(&(acl->lock), NULL) != 0) {
nfs4_acl_free(acl);
LogCrit(COMPONENT_NFS_V4_ACL,
"New ACL RW lock init returned %d (%s)", errno,
strerror(errno));
*status = NFS_V4_ACL_INIT_ENTRY_FAILED;
nfs4_ace_free(acldata->aces);
hashtable_releaselatched(fsal_acl_hash, &latch);
return NULL;
}
acl->naces = acldata->naces;
acl->aces = acldata->aces;
acl->ref = 1; /* We give out one reference */
/* Build the value */
value.addr = acl;
value.len = sizeof(fsal_acl_t);
rc = hashtable_setlatched(fsal_acl_hash, &key, &value, &latch,
HASHTABLE_SET_HOW_SET_NO_OVERWRITE, NULL,
NULL);
if (rc != HASHTABLE_SUCCESS) {
/* Put the entry back in its pool */
nfs4_acl_free(acl);
LogWarn(COMPONENT_NFS_V4_ACL,
"New ACL entry could not be added to hash, rc=%s",
hash_table_err_to_str(rc));
*status = NFS_V4_ACL_HASH_SET_ERROR;
return NULL;
}
return acl;
}
fsal_acl_t *nfs4_acl_new_entry(fsal_acl_data_t *pacldata, fsal_acl_status_t *pstatus)
{
fsal_acl_t *pacl = NULL;
hash_buffer_t buffkey;
hash_buffer_t buffvalue;
int rc;
/* Set the return default to NFS_V4_ACL_SUCCESS */
*pstatus = NFS_V4_ACL_SUCCESS;
LogDebug(COMPONENT_NFS_V4_ACL, "nfs4_acl_new_entry: acl hash table size = %u",
HashTable_GetSize(fsal_acl_hash));
/* Turn the input to a hash key */
if(nfs4_acldata_2_key(&buffkey, pacldata))
{
*pstatus = NFS_V4_ACL_UNAPPROPRIATED_KEY;
nfs4_release_acldata_key(&buffkey);
nfs4_ace_free(pacldata->aces);
return NULL;
}
/* Check if the entry doesn't already exists */
if(HashTable_Get(fsal_acl_hash, &buffkey, &buffvalue) == HASHTABLE_SUCCESS)
{
/* Entry is already in the cache, do not add it */
pacl = (fsal_acl_t *) buffvalue.pdata;
*pstatus = NFS_V4_ACL_EXISTS;
nfs4_release_acldata_key(&buffkey);
nfs4_ace_free(pacldata->aces);
return pacl;
}
/* Adding the entry in the cache */
pacl = nfs4_acl_alloc();
if(rw_lock_init(&(pacl->lock)) != 0)
{
nfs4_acl_free(pacl);
LogCrit(COMPONENT_NFS_V4_ACL,
"nfs4_acl_new_entry: rw_lock_init returned %d (%s)",
errno, strerror(errno));
*pstatus = NFS_V4_ACL_INIT_ENTRY_FAILED;
nfs4_release_acldata_key(&buffkey);
nfs4_ace_free(pacldata->aces);
return NULL;
}
pacl->naces = pacldata->naces;
pacl->aces = pacldata->aces;
pacl->ref = 0;
/* Build the value */
buffvalue.pdata = (caddr_t) pacl;
buffvalue.len = sizeof(fsal_acl_t);
if((rc =
HashTable_Test_And_Set(fsal_acl_hash, &buffkey, &buffvalue,
HASHTABLE_SET_HOW_SET_NO_OVERWRITE)) != HASHTABLE_SUCCESS)
{
/* Put the entry back in its pool */
nfs4_acl_free(pacl);
LogWarn(COMPONENT_NFS_V4_ACL,
"nfs4_acl_new_entry: entry could not be added to hash, rc=%d",
rc);
if( rc != HASHTABLE_ERROR_KEY_ALREADY_EXISTS )
{
*pstatus = NFS_V4_ACL_HASH_SET_ERROR;
nfs4_release_acldata_key(&buffkey);
return NULL;
}
else
{
LogDebug(COMPONENT_NFS_V4_ACL,
"nfs4_acl_new_entry: concurrency detected during acl insertion");
/* This situation occurs when several threads try to init the same uncached entry
* at the same time. The first creates the entry and the others got HASHTABLE_ERROR_KEY_ALREADY_EXISTS
* In this case, the already created entry (by the very first thread) is returned */
if((rc = HashTable_Get(fsal_acl_hash, &buffkey, &buffvalue)) != HASHTABLE_SUCCESS)
{
*pstatus = NFS_V4_ACL_HASH_SET_ERROR;
nfs4_release_acldata_key(&buffkey);
return NULL;
}
pacl = (fsal_acl_t *) buffvalue.pdata;
*pstatus = NFS_V4_ACL_SUCCESS;
nfs4_release_acldata_key(&buffkey);
return pacl;
}
}
return pacl;
}