/** compare [name] with tree [node] represented object name by loading
uffs_FileInfo from storage */
UBOOL uffs_TreeCompareFileName(uffs_Device *dev,
const char *name, u32 len, u16 sum,
TreeNode *node, int type)
{
UBOOL matched = U_FALSE;
uffs_FileInfo *fi;
uffs_Buf *buf;
u16 data_sum;
buf = uffs_BufGetEx(dev, type, node, 0, 0);
if (buf == NULL) {
uffs_Perror(UFFS_MSG_SERIOUS, "can't get buf !\n ");
goto ext;
}
fi = (uffs_FileInfo *)(buf->data);
data_sum = uffs_MakeSum16(fi->name, fi->name_len);
if (data_sum != sum) {
uffs_Perror(UFFS_MSG_NORMAL,
"the obj's sum in storage is different with given sum!");
goto ext;
}
if (fi->name_len == len) {
if(uffs_CompareFileName(fi->name, fi->name_len, name) == U_TRUE) {
matched = U_TRUE;
}
}
ext:
if (buf)
uffs_BufPut(dev, buf);
return matched;
}
/**
* create a new file on a free block
* \param[in] dev uffs device
* \param[in] parent parent dir serial num
* \param[in] serial serial num of this new file
* \param[in] bc block information
* \param[in] fi file information
* \note parent, serial, bc must be provided before,
* and all information in fi should be filled well before.
*/
URET uffs_CreateNewFile(uffs_Device *dev,
u16 parent, u16 serial,
uffs_BlockInfo *bc, uffs_FileInfo *fi)
{
uffs_Tags *tag;
uffs_Buf *buf;
uffs_BlockInfoLoad(dev, bc, 0);
tag = GET_TAG(bc, 0);
TAG_PARENT(tag) = parent;
TAG_SERIAL(tag) = serial;
TAG_DATA_LEN(tag) = sizeof(uffs_FileInfo);
buf = uffs_BufGet(dev, parent, serial, 0);
if (buf == NULL) {
uffs_Perror(UFFS_MSG_SERIOUS, "get buf fail.");
return U_FAIL;
}
memcpy(buf->data, fi, TAG_DATA_LEN(tag));
buf->data_len = TAG_DATA_LEN(tag);
return uffs_BufPut(dev, buf);
}
static URET _LoadObjectInfo(uffs_Device *dev, TreeNode *node, uffs_ObjectInfo *info, int type, int *err)
{
uffs_Buf *buf;
buf = uffs_BufGetEx(dev, (u8)type, node, 0);
if (buf == NULL) {
if (err)
*err = UENOMEM;
return U_FAIL;
}
memcpy(&(info->info), buf->data, sizeof(uffs_FileInfo));
if (type == UFFS_TYPE_DIR) {
info->len = 0;
info->serial = node->u.dir.serial;
}
else {
info->len = node->u.file.len;
info->serial = node->u.file.serial;
}
uffs_BufPut(dev, buf);
return U_SUCC;
}
/**
* Close an openned object.
*
* \param[in] obj object to be closed
* \return U_SUCC or U_FAIL (error code in obj->err).
*/
URET uffs_CloseObject(uffs_Object *obj)
{
#ifdef CONFIG_CHANGE_MODIFY_TIME
uffs_Device *dev;
uffs_Buf *buf;
uffs_FileInfo fi;
#endif
if(obj->dev == NULL || obj->open_succ != U_TRUE) {
obj->err = UEBADF;
goto ext;
}
uffs_ObjectDevLock(obj);
if (obj->oflag & (UO_WRONLY|UO_RDWR|UO_APPEND|UO_CREATE|UO_TRUNC)) {
#ifdef CONFIG_CHANGE_MODIFY_TIME
dev = obj->dev;
if (obj->node) {
//need to change the last modify time stamp
if (obj->type == UFFS_TYPE_DIR)
buf = uffs_BufGetEx(dev, UFFS_TYPE_DIR, obj->node, 0, obj->oflag);
else
buf = uffs_BufGetEx(dev, UFFS_TYPE_FILE, obj->node, 0, obj->oflag);
if(buf == NULL) {
uffs_Perror(UFFS_MSG_SERIOUS, "can't get file header");
do_FlushObject(obj);
uffs_ObjectDevUnLock(obj);
goto ext;
}
uffs_BufRead(dev, buf, &fi, 0, sizeof(uffs_FileInfo));
fi.last_modify = uffs_GetCurDateTime();
uffs_BufWrite(dev, buf, &fi, 0, sizeof(uffs_FileInfo));
uffs_BufPut(dev, buf);
}
#endif
do_FlushObject(obj);
}
uffs_ObjectDevUnLock(obj);
ext:
do_ReleaseObjectResource(obj);
return (obj->err == UENOERR ? U_SUCC : U_FAIL);
}
static int do_WriteNewBlock(uffs_Object *obj,
const void *data, u32 len,
u16 parent,
u16 serial)
{
uffs_Device *dev = obj->dev;
u16 page_id;
int wroteSize = 0;
int size;
uffs_Buf *buf;
URET ret;
for (page_id = 0; page_id < dev->attr->pages_per_block; page_id++) {
size = (len - wroteSize) > dev->com.pg_data_size ?
dev->com.pg_data_size : len - wroteSize;
if (size <= 0)
break;
buf = uffs_BufNew(dev, UFFS_TYPE_DATA, parent, serial, page_id);
if (buf == NULL) {
uffs_Perror(UFFS_MSG_SERIOUS, "can't create a new page ?");
break;
}
// Note: if data == NULL, we will fill '\0'
ret = uffs_BufWrite(dev, buf, data == NULL ? NULL : (u8 *)data + wroteSize, 0, size);
uffs_BufPut(dev, buf);
if (ret != U_SUCC) {
uffs_Perror(UFFS_MSG_SERIOUS, "write data fail!");
break;
}
wroteSize += size;
obj->node->u.file.len += size;
}
return wroteSize;
}
static int do_WriteInternalBlock(uffs_Object *obj,
TreeNode *node,
u16 fdn,
const void *data,
u32 len,
u32 blockOfs)
{
uffs_Device *dev = obj->dev;
u16 maxPageID;
u16 page_id;
u32 size;
u32 pageOfs;
u32 wroteSize = 0;
URET ret;
uffs_Buf *buf;
u32 block_start;
u8 type;
u16 parent, serial;
block_start = GetStartOfDataBlock(obj, fdn);
if (fdn == 0) {
type = UFFS_TYPE_FILE;
parent = node->u.file.parent;
serial = node->u.file.serial;
}
else {
type = UFFS_TYPE_DATA;
parent = node->u.data.parent;
serial = fdn;
}
if (fdn == 0)
maxPageID = obj->head_pages;
else
maxPageID = dev->attr->pages_per_block - 1;
while (wroteSize < len) {
page_id = blockOfs / dev->com.pg_data_size;
if (fdn == 0)
page_id++; //in file header, page_id start from 1, not 0.
if (page_id > maxPageID)
break;
pageOfs = blockOfs % dev->com.pg_data_size;
size = (len - wroteSize + pageOfs) > dev->com.pg_data_size ?
(dev->com.pg_data_size - pageOfs) : (len - wroteSize);
if ((obj->node->u.file.len % dev->com.pg_data_size) == 0 &&
(blockOfs + block_start) == obj->node->u.file.len) {
buf = uffs_BufNew(dev, type, parent, serial, page_id);
if(buf == NULL) {
uffs_Perror(UFFS_MSG_SERIOUS, "can create a new buf!");
break;
}
}
else {
buf = uffs_BufGetEx(dev, type, node, page_id, obj->oflag);
if (buf == NULL) {
uffs_Perror(UFFS_MSG_SERIOUS, "can't get buffer ?");
break;
}
}
// Note: if data == NULL, then we will fill '\0'
ret = uffs_BufWrite(dev, buf, data == NULL ? NULL : (u8 *)data + wroteSize, pageOfs, size);
uffs_BufPut(dev, buf);
if (ret == U_FAIL) {
uffs_Perror(UFFS_MSG_SERIOUS, "write inter data fail!");
break;
}
wroteSize += size;
blockOfs += size;
if (block_start + blockOfs > obj->node->u.file.len)
obj->node->u.file.len = block_start + blockOfs;
}
return wroteSize;
}
/**
* Create an object under the given dir.
*
* \param[in|out] obj to be created, obj is returned from uffs_GetObject()
* \param[in] dev uffs device
* \param[in] dir object parent dir serial NO.
* \param[in] name point to the object name
* \param[in] name_len object name length
* \param[in] oflag open flag. UO_DIR should be passed for an dir object.
*
* \return U_SUCC or U_FAIL (error code in obj->err).
*/
URET uffs_CreateObjectEx(uffs_Object *obj, uffs_Device *dev,
int dir, const char *name, int name_len, int oflag)
{
uffs_Buf *buf = NULL;
uffs_FileInfo fi;
TreeNode *node;
obj->dev = dev;
obj->parent = dir;
obj->type = (oflag & UO_DIR ? UFFS_TYPE_DIR : UFFS_TYPE_FILE);
obj->name = name;
obj->name_len = name_len;
if (obj->type == UFFS_TYPE_DIR) {
if (name[obj->name_len - 1] == '/') // get rid of ending '/' for dir
obj->name_len--;
}
else {
if (name[obj->name_len - 1] == '/') { // file name can't end with '/'
obj->err = UENOENT;
goto ext;
}
}
if (obj->name_len == 0) { // empty name ?
obj->err = UENOENT;
goto ext;
}
obj->sum = uffs_MakeSum16(obj->name, obj->name_len);
uffs_ObjectDevLock(obj);
if (obj->type == UFFS_TYPE_DIR) {
//find out whether have file with the same name
node = uffs_TreeFindFileNodeByName(obj->dev, obj->name,
obj->name_len, obj->sum,
obj->parent);
if (node != NULL) {
obj->err = UEEXIST; // we can't create a dir has the
// same name with exist file.
goto ext_1;
}
obj->node = uffs_TreeFindDirNodeByName(obj->dev, obj->name,
obj->name_len, obj->sum,
obj->parent);
if (obj->node != NULL) {
obj->err = UEEXIST; // we can't create a dir already exist.
goto ext_1;
}
}
else {
//find out whether have dir with the same name
node = uffs_TreeFindDirNodeByName(obj->dev, obj->name,
obj->name_len, obj->sum,
obj->parent);
if (node != NULL) {
obj->err = UEEXIST;
goto ext_1;
}
obj->node = uffs_TreeFindFileNodeByName(obj->dev, obj->name,
obj->name_len, obj->sum,
obj->parent);
if (obj->node) {
/* file already exist, truncate it to zero length */
obj->serial = GET_OBJ_NODE_SERIAL(obj);
obj->open_succ = U_TRUE; // set open_succ to U_TRUE before
// call do_TruncateObject()
if (do_TruncateObject(obj, 0, eDRY_RUN) == U_SUCC)
do_TruncateObject(obj, 0, eREAL_RUN);
goto ext_1;
}
}
/* dir|file does not exist, create a new one */
obj->serial = uffs_FindFreeFsnSerial(obj->dev);
if (obj->serial == INVALID_UFFS_SERIAL) {
uffs_Perror(UFFS_MSG_SERIOUS, "No free serial num!");
obj->err = UENOMEM;
goto ext_1;
}
if (obj->dev->tree.erased_count < obj->dev->cfg.reserved_free_blocks) {
uffs_Perror(UFFS_MSG_NOISY,
"insufficient block in create obj");
obj->err = UENOMEM;
goto ext_1;
}
buf = uffs_BufNew(obj->dev, obj->type, obj->parent, obj->serial, 0);
if (buf == NULL) {
uffs_Perror(UFFS_MSG_SERIOUS,
"Can't create new buffer when create obj!");
goto ext_1;
}
memset(&fi, 0, sizeof(uffs_FileInfo));
fi.name_len = obj->name_len < sizeof(fi.name) ? obj->name_len : sizeof(fi.name) - 1;
memcpy(fi.name, obj->name, fi.name_len);
fi.name[fi.name_len] = '\0';
fi.access = 0;
fi.attr |= FILE_ATTR_WRITE;
if (obj->type == UFFS_TYPE_DIR)
fi.attr |= FILE_ATTR_DIR;
fi.create_time = fi.last_modify = uffs_GetCurDateTime();
uffs_BufWrite(obj->dev, buf, &fi, 0, sizeof(uffs_FileInfo));
uffs_BufPut(obj->dev, buf);
// flush buffer immediately,
// so that the new node will be inserted into the tree
uffs_BufFlushGroup(obj->dev, obj->parent, obj->serial);
// update obj->node: after buf flushed,
// the NEW node can be found in the tree
if (obj->type == UFFS_TYPE_DIR)
obj->node = uffs_TreeFindDirNode(obj->dev, obj->serial);
else
obj->node = uffs_TreeFindFileNode(obj->dev, obj->serial);
if (obj->node == NULL) {
uffs_Perror(UFFS_MSG_NOISY, "Can't find the node in the tree ?");
obj->err = UEIOERR;
goto ext_1;
}
if (obj->type == UFFS_TYPE_FILE)
obj->node->u.file.len = 0; //init the length to 0
if (HAVE_BADBLOCK(obj->dev))
uffs_BadBlockRecover(obj->dev);
obj->open_succ = U_TRUE;
ext_1:
uffs_ObjectDevUnLock(obj);
ext:
return (obj->err == UENOERR ? U_SUCC : U_FAIL);
}
/**
* Remove object under a new parent, change object name.
*
* \param[in|out] obj
* \param[in] new_parent new parent's serial number
* \param[in] new_name new name of the object.
* if new_name == NULL, keep the old name.
* \param[in] name_len new name length.
*
* \return U_SUCC or U_FAIL (obj->err for the reason)
*/
URET uffs_MoveObjectEx(uffs_Object *obj,
int new_parent, const char *new_name, int name_len)
{
uffs_Buf *buf;
uffs_FileInfo fi;
uffs_Device *dev = obj->dev;
TreeNode *node = obj->node;
if (dev == NULL || node == NULL || obj->open_succ != U_TRUE) {
obj->err = UEBADF;
goto ext;
}
uffs_ObjectDevLock(obj);
obj->parent = new_parent;
if (name_len > 0) {
buf = uffs_BufGetEx(dev, obj->type, node, 0, obj->oflag);
if (buf == NULL) {
uffs_Perror(UFFS_MSG_SERIOUS, "can't get buf when rename!");
obj->err = UEIOERR;
goto ext_1;
}
memcpy(&fi, buf->data, sizeof(uffs_FileInfo));
if (new_name[name_len-1] == '/')
name_len--;
memcpy(fi.name, new_name, name_len);
fi.name[name_len] = 0;
fi.name_len = name_len;
fi.last_modify = uffs_GetCurDateTime();
buf->parent = new_parent; // !! need to manually change the 'parent' !!
uffs_BufWrite(dev, buf, &fi, 0, sizeof(uffs_FileInfo));
uffs_BufPut(dev, buf);
// !! force a block recover so that all old tag will be expired !!
// This is important so we only need to check
// the first spare when mount UFFS :)
uffs_BufFlushGroupEx(dev, obj->parent, obj->serial, U_TRUE);
obj->name = new_name;
obj->name_len = name_len;
obj->sum = uffs_MakeSum16(fi.name, fi.name_len);
}
//update the check sum and new parent of tree node
if (obj->type == UFFS_TYPE_DIR) {
obj->node->u.dir.checksum = obj->sum;
obj->node->u.dir.parent = new_parent;
}
else {
obj->node->u.file.checksum = obj->sum;
obj->node->u.file.parent = new_parent;
}
ext_1:
uffs_ObjectDevUnLock(obj);
ext:
return (obj->err == UENOERR ? U_SUCC : U_FAIL);
}
//
// To trancate the file, this is the last block to be trancated.
// We need to discard one or more pages within this block, hence requires 'block recover'.
//
static URET do_TruncateInternalWithBlockRecover(uffs_Object *obj,
u16 fdn, u32 remain, RunOptionE run_opt)
{
uffs_Device *dev = obj->dev;
TreeNode *fnode = obj->node;
u16 page_id, max_page_id;
TreeNode *node;
uffs_Buf *buf = NULL;
u8 type;
u32 block_start, block_offset;
u16 parent, serial;
int slot;
uffs_BlockInfo *bc = NULL;
int block = -1;
if (fdn == 0) {
node = fnode;
type = UFFS_TYPE_FILE;
max_page_id = obj->head_pages;
block_start = 0;
parent = node->u.file.parent;
serial = node->u.file.serial;
block = node->u.file.block;
}
else {
node = uffs_TreeFindDataNode(dev, fnode->u.file.serial, fdn);
if (node == NULL) {
obj->err = UEIOERR;
uffs_Perror(UFFS_MSG_SERIOUS,
"can't find data node when truncate obj");
goto ext;
}
block = node->u.data.block;
type = UFFS_TYPE_DATA;
max_page_id = dev->attr->pages_per_block - 1;
block_start = obj->head_pages * dev->com.pg_data_size +
(fdn - 1) * dev->com.pg_data_size *
dev->attr->pages_per_block;
parent = node->u.data.parent;
serial = node->u.data.serial;
}
if (run_opt == eDRY_RUN) {
// checking the buffer. this is the main reason why we need the 'dry run' mode.
for (page_id = 0; page_id <= max_page_id; page_id++) {
buf = uffs_BufFind(dev, parent, serial, page_id);
if (buf) {
//!< ok, the buffer was loaded before ...
if (uffs_BufIsFree(buf) == U_FALSE) {
obj->err = UEEXIST;
break; //!< and someone is still holding the buffer,
// can't truncate it !!!
}
}
}
buf = NULL;
goto ext;
}
// find the last page *after* truncate
block_offset = remain - block_start;
page_id = block_offset / dev->com.pg_data_size;
if (fdn == 0)
page_id++;
if (!uffs_Assert(page_id <= max_page_id, "fdn = %d, block_start = %d, remain = %d\n", fdn, block_start, remain)) {
obj->err = UEUNKNOWN_ERR;
goto ext;
}
// flush buffer before performing block recovery
uffs_BufFlushGroup(dev, parent, serial);
// load the last page
buf = uffs_BufGetEx(dev, type, node, page_id, obj->oflag);
if (buf == NULL) {
obj->err = UENOMEM;
uffs_Perror(UFFS_MSG_SERIOUS, "Can't get buf");
goto ext;
}
uffs_BufWrite(dev, buf, NULL, 0, 0); // just make this buf dirty
// lock the group
slot = uffs_BufFindGroupSlot(dev, parent, serial);
uffs_BufLockGroup(dev, slot);
if (remain == 0) // remain == 0: means discard all data in this block.
buf->data_len = 0;
else {
remain = (remain % dev->com.pg_data_size);
// remain == 0: means that we need to keep all data in this page.
buf->data_len = (remain == 0 ? dev->com.pg_data_size : remain);
}
/* mark this buf as UFFS_BUF_EXT_MARK_TRUNC_TAIL, when flushing
dirty buffers, UFFS will not do page recover for pages after
this buf page id (because this file is ended at this page) */
buf->ext_mark |= UFFS_BUF_EXT_MARK_TRUNC_TAIL;
uffs_BufPut(dev, buf);
// invalidate the rest page buf
page_id++;
for (; page_id <= max_page_id; page_id++) {
buf = uffs_BufFind(dev, parent, serial, page_id);
if (buf)
uffs_BufMarkEmpty(dev, buf);
}
// flush dirty buffer immediately, forcing block recovery.
uffs_BufFlushGroupEx(dev, parent, serial, U_TRUE);
// unlock the group
uffs_BufUnLockGroup(dev, slot);
// Invalidate block info cache for the 'old' block
bc = uffs_BlockInfoGet(dev, block);
if (bc) {
uffs_BlockInfoExpire(dev, bc, UFFS_ALL_PAGES);
uffs_BlockInfoPut(dev, bc);
}
ext:
return (obj->err == UENOERR ? U_SUCC : U_FAIL);
}
/**
* read data from obj
*
* \param[in] obj uffs object
* \param[out] data output data buffer
* \param[in] len required length of data to be read from object->pos
*
* \return return bytes of data have been read
*/
int uffs_ReadObject(uffs_Object *obj, void *data, int len)
{
uffs_Device *dev = obj->dev;
TreeNode *fnode = NULL;
u32 remain = len;
u16 fdn;
u32 read_start;
TreeNode *dnode;
u32 size;
uffs_Buf *buf;
u32 blockOfs;
u16 page_id;
u8 type;
u32 pageOfs;
if (obj == NULL)
return 0;
fnode = obj->node;
if (obj->dev == NULL || obj->open_succ == U_FALSE) {
obj->err = UEBADF;
return 0;
}
if (obj->type == UFFS_TYPE_DIR) {
uffs_Perror(UFFS_MSG_NOISY, "Can't read data from a dir object!");
obj->err = UEBADF;
return 0;
}
if (obj->pos > fnode->u.file.len) {
return 0; //can't read file out of range
}
if (obj->oflag & UO_WRONLY) {
obj->err = UEACCES;
return 0;
}
uffs_ObjectDevLock(obj);
while (remain > 0) {
read_start = obj->pos + len - remain;
if (read_start >= fnode->u.file.len) {
//uffs_Perror(UFFS_MSG_NOISY, "read point out of file ?");
break;
}
fdn = GetFdnByOfs(obj, read_start);
if (fdn == 0) {
dnode = obj->node;
type = UFFS_TYPE_FILE;
}
else {
type = UFFS_TYPE_DATA;
dnode = uffs_TreeFindDataNode(dev, fnode->u.file.serial, fdn);
if (dnode == NULL) {
uffs_Perror(UFFS_MSG_SERIOUS, "can't get data node in entry!");
obj->err = UEUNKNOWN_ERR;
break;
}
}
blockOfs = GetStartOfDataBlock(obj, fdn);
page_id = (read_start - blockOfs) / dev->com.pg_data_size;
if (fdn == 0) {
/**
* fdn == 0: this means that the reading is start from the first block,
* since the page 0 is for file attr, so we move to the next page ID.
*/
page_id++;
}
buf = uffs_BufGetEx(dev, type, dnode, (u16)page_id, obj->oflag);
if (buf == NULL) {
uffs_Perror(UFFS_MSG_SERIOUS, "can't get buffer when read obj.");
obj->err = UEIOERR;
break;
}
pageOfs = read_start % dev->com.pg_data_size;
if (pageOfs >= buf->data_len) {
//uffs_Perror(UFFS_MSG_NOISY, "read data out of page range ?");
uffs_BufPut(dev, buf);
break;
}
size = (remain + pageOfs > buf->data_len ? buf->data_len - pageOfs : remain);
uffs_BufRead(dev, buf, (u8 *)data + len - remain, pageOfs, size);
uffs_BufPut(dev, buf);
remain -= size;
}
obj->pos += (len - remain);
if (HAVE_BADBLOCK(dev))
uffs_BadBlockRecover(dev);
uffs_ObjectDevUnLock(obj);
uffs_Assert(fnode == obj->node, "obj->node change!\n");
return len - remain;
}
static URET do_TruncateInternalWithBlockRecover(uffs_Object *obj, u16 fdn, u32 remain, UBOOL dry_run)
{
uffs_Device *dev = obj->dev;
TreeNode *fnode = obj->node;
u16 page_id, max_page_id;
TreeNode *node;
uffs_Buf *buf = NULL;
u8 type;
u32 block_start;
u16 parent, serial;
int slot;
if (fdn == 0) {
node = fnode;
type = UFFS_TYPE_FILE;
max_page_id = obj->head_pages;
block_start = 0;
parent = node->u.file.parent;
serial = node->u.file.serial;
}
else {
node = uffs_TreeFindDataNode(dev, fnode->u.file.serial, fdn);
if (node == NULL) {
obj->err = UEIOERR;
uffs_Perror(UFFS_ERR_SERIOUS, "can't find data node when truncate obj");
goto ext;
}
type = UFFS_TYPE_DATA;
max_page_id = dev->attr->pages_per_block - 1;
block_start = obj->head_pages * dev->com.pg_data_size + (fdn - 1) * dev->com.pg_data_size * dev->attr->pages_per_block;
parent = node->u.data.parent;
serial = node->u.data.serial;
}
if (dry_run == U_TRUE) {
// checking the buffer. this is the main reason why we need the 'dry run' mode.
for (page_id = 0; page_id <= max_page_id; page_id++) {
buf = uffs_BufFind(dev, parent, serial, page_id);
if (buf) { //!< ok, the buffer was loaded before ...
if (uffs_BufIsFree(buf) == U_FALSE) {
obj->err = UEEXIST;
break; //!< and someone is still holding the buffer, can't truncate it !!!
}
}
}
buf = NULL;
goto ext;
}
// find the last page after truncate
for (page_id = (fdn == 0 ? 1 : 0); page_id <= max_page_id; page_id++) {
if (block_start + (page_id + 1) * dev->com.pg_data_size >= remain)
break;
}
if (page_id > max_page_id) {
obj->err = UEUNKNOWN;
uffs_Perror(UFFS_ERR_SERIOUS, "Overflow");
goto ext;
}
// flush buffer before performing block recovery
uffs_BufFlushGroup(dev, parent, serial);
// load the last page
buf = uffs_BufGetEx(dev, type, node, page_id);
if (buf == NULL) {
obj->err = UENOMEM;
uffs_Perror(UFFS_ERR_SERIOUS, "Can't get buf");
goto ext;
}
uffs_BufWrite(dev, buf, NULL, 0, 0); // just make this buf dirty
// lock the group
slot = uffs_BufFindGroupSlot(dev, parent, serial);
uffs_BufLockGroup(dev, slot);
if (remain == 0)
buf->data_len = 0;
else {
remain = (remain % dev->com.pg_data_size);
buf->data_len = (remain == 0 ? dev->com.pg_data_size : 0);
}
buf->ext_mark |= UFFS_BUF_EXT_MARK_TRUNC_TAIL;
uffs_BufPut(dev, buf);
// invalidate the rest page buf
page_id++;
for (; page_id <= max_page_id; page_id++) {
buf = uffs_BufFind(dev, parent, serial, page_id);
if (buf)
uffs_BufMarkEmpty(dev, buf);
}
// flush dirty buffer immediately, forcing block recovery.
uffs_BufFlushGroupEx(dev, parent, serial, U_TRUE);
// unlock the group
uffs_BufUnLockGroup(dev, slot);
ext:
return (obj->err == UENOERR ? U_SUCC : U_FAIL);
}
