long do_fsync(struct file *file, int datasync)
{
int ret;
int err;
struct address_space *mapping = file->f_mapping;
if (live_transaction()){
/* DEP 5/27/10 - Defer fsync until commit. */
struct deferred_object_operation *def_op;
txobj_thread_list_node_t *list_node = workset_has_object(&file->f_mapping->host->xobj);
if (!list_node) {
tx_cache_get_file_ro(file);
tx_cache_get_inode_ro(file->f_mapping->host);
list_node = workset_has_object(&file->f_mapping->host->xobj);
}
def_op = alloc_deferred_object_operation();
INIT_LIST_HEAD(&def_op->list);
def_op->type = DEFERRED_TYPE_FSYNC;
def_op->u.fsync.datasync = datasync;
def_op->u.fsync.file = file;
/* DEP: Pin the file until the sync is executed */
tx_atomic_inc_not_zero(&file->f_count);
// XXX: Could probably use something finer grained here.
WORKSET_LOCK(current->transaction);
list_add(&def_op->list, &list_node->deferred_operations);
WORKSET_UNLOCK(current->transaction);
return 0;
}
if (!file->f_op || !file->f_op->fsync) {
/* Why? We can still call filemap_fdatawrite */
ret = -EINVAL;
goto out;
}
ret = filemap_fdatawrite(mapping);
/*
* We need to protect against concurrent writers, which could cause
* livelocks in fsync_buffers_list().
*/
if (!committing_transaction())
mutex_lock(&mapping->host->i_mutex);
err = file->f_op->fsync(file, file_get_dentry(file), datasync);
if (!ret)
ret = err;
if (!committing_transaction())
mutex_unlock(&mapping->host->i_mutex);
err = filemap_fdatawait(mapping);
if (!ret)
ret = err;
out:
return ret;
}
struct _dentry * __tx_cache_get_dentry(struct dentry * dentry, enum access_mode mode){
txobj_thread_list_node_t * list_node = NULL;
struct _dentry *_dentry;
struct _dentry *shadow;
int task_count = atomic_read(¤t->transaction->task_count);
int should_sleep = 0;
struct transaction *winner;
#ifdef CONFIG_TX_KSTM_PROF
unsigned long long cycles, a;
rdtscll(cycles);
#endif
#ifdef CONFIG_TX_KSTM_ASSERTIONS
struct _dentry * checkpoint;
BUG_ON(dentry == NULL);
#endif
/* Protect the read with an rcu read lock */
rcu_read_lock();
_dentry = dentry->d_contents;
rcu_read_unlock();
KSTM_BUG_ON(_dentry == NULL);
KSTM_BUG_ON(shadow(_dentry));
/* Next, make sure we don't already have the object */
list_node = workset_has_object(&dentry->xobj);
if(list_node) {
if(task_count > 1)
lock_my_dentry(dentry, 1);
workset_hit:
shadow = list_node->shadow_obj;
if(list_node->rw < mode){
struct _dentry *old_shadow;
/* Upgrade the mode */
if(task_count == 1)
LOCK_XOBJ(&dentry->xobj);
winner =
upgrade_xobj_mode(list_node->tx_obj, mode, &should_sleep);
if(winner){
if(!should_sleep)
winner = NULL;
if(task_count == 1)
UNLOCK_XOBJ(&dentry->xobj);
else
unlock_my_dentry(dentry, 1);
abort_self(winner, 0);
}
list_node->rw = mode;
if(task_count == 1)
UNLOCK_XOBJ(&dentry->xobj);
/* the object is read-shared and we must copy it */
old_shadow = shadow;
shadow = __shadow_copy_dentry(dentry, _dentry,
mode, task_count);
if(unlikely(IS_ERR(shadow))){
if(task_count > 1)
unlock_my_dentry(dentry, 1);
goto out;
}
list_node->rw = mode;
list_node->shadow_obj = shadow;
atomic_dec(&old_shadow->tx_readcount);
if(dentry->d_contents == old_shadow)
atomic_dec(&old_shadow->tx_refcount);
else
free_tx_dentry(old_shadow);
}
if(task_count > 1)
unlock_my_dentry(dentry, 1);
goto out;
}
/* At this point, we definitely don't have the object. Add
* it!
*/
if(task_count > 1){
lock_my_dentry(dentry, 1);
/* Recheck that another task didn't add the object */
if((list_node = workset_has_object_locked(&dentry->xobj)))
goto workset_hit;
} else
LOCK_XOBJ(&dentry->xobj);
list_node = tx_check_add_obj(&dentry->xobj, TYPE_DENTRY, mode, &should_sleep, &winner);
if(unlikely(!list_node)){
if(!should_sleep)
winner = NULL;
if(task_count > 1)
unlock_my_dentry(dentry, 1);
else
UNLOCK_XOBJ(&dentry->xobj);
abort_self(winner, 0);
}
if(task_count == 1)
UNLOCK_XOBJ(&dentry->xobj);
/* Go ahead an increment the refcount so we don't get freed */
tx_atomic_inc_nolog(&dentry->d_count);
// Allocate the shadow copy and update the local workset
if(mode == ACCESS_R){
// Share it
shadow = _dentry;
//we'll ignore this bug for now:
//if(atomic_read(&_dentry->tx_refcount) == 1)
// OSA_MAGIC(OSA_BREAKSIM);
atomic_inc(&_dentry->tx_refcount);
atomic_inc(&_dentry->tx_readcount);
} else {
// Get our own
shadow = __shadow_copy_dentry(dentry, _dentry,
mode, task_count);
if(unlikely(IS_ERR(shadow)))
goto out;
}
#ifdef CONFIG_TX_KSTM_ASSERTIONS
checkpoint = __checkpoint_dentry(_dentry);
if(unlikely(checkpoint == NULL)){
if(shadow != _dentry)
__free_tx_dentry(shadow);
shadow = ERR_PTR(-ETXABORT);
goto out;
}
#endif
if(unlikely(__setup_list_node(list_node, dentry, shadow,
#ifdef CONFIG_TX_KSTM_ASSERTIONS
checkpoint,
#endif
mode, &dentry->xobj)))
shadow = ERR_PTR(-ETXABORT);
if(task_count > 1)
unlock_my_dentry(dentry, 1);
out:
#ifdef CONFIG_TX_KSTM_PROF
rdtscll(a);
shadowCopyCycles += (a - cycles);
#endif
return shadow;
}
