/**
* \brief delete uffs object
*
* \param[in] name full name of object
* \param[out] err return error code
*
* \return U_SUCC if object is deleted successfully.
* return U_FAIL if error happen, error code is set to *err.
*/
URET uffs_DeleteObject(const char * name, int *err)
{
uffs_Object *obj, *work;
TreeNode *node, *d_node;
uffs_Device *dev = NULL;
u16 block;
u16 serial, parent, last_serial;
UBOOL bad = U_FALSE;
URET ret = U_FAIL;
obj = uffs_GetObject();
if (obj == NULL) {
if (err)
*err = UEMFILE;
goto ext_unlock;
}
if (uffs_OpenObject(obj, name, UO_RDWR|UO_DIR) == U_FAIL) {
if (uffs_OpenObject(obj, name, UO_RDWR) == U_FAIL) {
if (err)
*err = UENOENT;
goto ext_unlock;
}
}
dev = obj->dev;
// working throught object pool see if the object is opened ...
uffs_ObjectDevLock(obj);
work = NULL;
while ((work = (uffs_Object *)uffs_PoolFindNextAllocated(&_object_pool, work)) != NULL) {
if (work != obj &&
work->dev &&
work->dev == obj->dev &&
work->node &&
work->node == obj->node) {
// this object is opened, can't delete it.
if (err)
*err = UEACCES;
goto ext_lock;
}
}
if (obj->type == UFFS_TYPE_DIR) {
// if the dir is not empty, can't delete it.
node = uffs_TreeFindDirNodeWithParent(dev, obj->serial);
if (node != NULL) {
if (err)
*err = UEACCES;
goto ext_lock; //have sub dirs ?
}
node = uffs_TreeFindFileNodeWithParent(dev, obj->serial);
if (node != NULL) {
if (err)
*err = UEACCES;
goto ext_lock; //have sub files ?
}
}
// before erase the block, we need to take care of the buffer ...
uffs_BufFlushAll(dev);
if (_CheckObjBufRef(obj) > 0) {
if (err)
*err = UEACCES;
goto ext_lock;
}
node = obj->node;
// ok, now we are safe to erase DIR/FILE block :-)
block = GET_BLOCK_FROM_NODE(obj);
parent = obj->serial;
last_serial = (obj->type == UFFS_TYPE_FILE && node->u.file.len > 0 ? GetFdnByOfs(obj, node->u.file.len - 1) : 0);
uffs_BreakFromEntry(dev, obj->type, node);
uffs_FlashEraseBlock(dev, block);
node->u.list.block = block;
node->u.list.u.serial = obj->serial;
// From now on, the object is gone physically,
// but we need to 'suspend' this node so that no one will re-use
// the serial number during deleting the reset part of object.
if (HAVE_BADBLOCK(dev)) {
uffs_BadBlockProcessSuspend(dev, node);
bad = U_TRUE; // will be put into 'bad' list later
}
else {
uffs_TreeSuspendAdd(dev, node);
bad = U_FALSE; // will be put into erased list later
}
// now erase DATA blocks
if (obj->type == UFFS_TYPE_FILE && last_serial > 0) {
for (serial = 1; serial <= last_serial; serial++) {
uffs_ObjectDevUnLock(obj);
; // yield CPU to improve responsive when deleting large file.
uffs_ObjectDevLock(obj);
d_node = uffs_TreeFindDataNode(dev, parent, serial);
if (uffs_Assert(d_node != NULL, "Can't find DATA node parent = %d, serial = %d\n", parent, serial)) {
uffs_BreakFromEntry(dev, UFFS_TYPE_DATA, d_node);
block = d_node->u.data.block;
uffs_FlashEraseBlock(dev, block);
d_node->u.list.block = block;
if (HAVE_BADBLOCK(dev))
uffs_BadBlockProcess(dev, d_node);
else
uffs_TreeInsertToErasedListTail(dev, d_node);
}
}
}
// now process the suspend node
uffs_TreeRemoveSuspendNode(dev, node);
if (bad)
uffs_TreeInsertToBadBlockList(dev, node);
else
uffs_TreeInsertToErasedListTail(dev, node);
ret = U_SUCC;
ext_lock:
uffs_ObjectDevUnLock(obj);
ext_unlock:
do_ReleaseObjectResource(obj);
uffs_PutObject(obj);
return ret;
}
/**
* \brief delete uffs object
*
* \param[in] name full name of object
* \param[out] err return error code
*
* \return U_SUCC if object is deleted successfully.
* return U_FAIL if error happen, error code is set to *err.
*/
URET uffs_DeleteObject(const char * name, int *err)
{
uffs_Object *obj;
TreeNode *node;
uffs_Device *dev;
u16 block;
uffs_Buf *buf;
URET ret = U_FAIL;
obj = uffs_GetObject();
if (obj == NULL) {
if (err)
*err = UEMFILE;
goto err1;
}
if (uffs_OpenObject(obj, name, UO_RDWR|UO_DIR) == U_FAIL) {
if (uffs_OpenObject(obj, name, UO_RDWR) == U_FAIL) {
if (err)
*err = UENOENT;
goto err1;
}
}
uffs_TruncateObject(obj, 0);
uffs_ObjectDevLock(obj);
dev = obj->dev;
if (obj->type == UFFS_TYPE_DIR)
{
// if the dir is not empty, can't delete it.
node = uffs_TreeFindDirNodeWithParent(dev, obj->serial);
if (node != NULL)
{
if (err)
*err = UEACCES;
goto err; //have sub dirs ?
}
node = uffs_TreeFindFileNodeWithParent(dev, obj->serial);
if (node != NULL)
{
if (err)
*err = UEACCES;
goto err; //have sub files ?
}
}
block = GET_BLOCK_FROM_NODE(obj);
node = obj->node;
// before erase the block, we need to take care of the buffer ...
uffs_BufFlushAll(dev);
if (HAVE_BADBLOCK(dev))
uffs_BadBlockRecover(dev);
buf = uffs_BufFind(dev, obj->parent, obj->serial, 0);
if (buf) {
//need to expire this buffer ...
if (buf->ref_count != 0) {
//there is other obj for this file still in use ?
uffs_Perror(UFFS_ERR_NORMAL, "Try to delete object but still have buf referenced.");
if (err)
*err = UEACCES;
goto err;
}
buf->mark = UFFS_BUF_EMPTY; //!< make this buffer expired.
}
//TODO: need to take care of other obj->node ?
uffs_BreakFromEntry(dev, obj->type, node);
uffs_FlashEraseBlock(dev, block);
node->u.list.block = block;
if (HAVE_BADBLOCK(dev))
uffs_BadBlockProcess(dev, node);
else
uffs_TreeInsertToErasedListTail(dev, node);
ret = U_SUCC;
err:
uffs_ObjectDevUnLock(obj);
err1:
do_ReleaseObjectResource(obj);
uffs_PutObject(obj);
return ret;
}