/** truncate obj without lock device */
static URET do_TruncateObject(uffs_Object *obj, u32 remain, RunOptionE run_opt)
{
uffs_Device *dev = obj->dev;
TreeNode *fnode = obj->node;
u16 fdn;
u32 flen;
u32 block_start;
TreeNode *node;
uffs_BlockInfo *bc;
uffs_Buf *buf;
u16 page;
int pos;
pos = obj->pos; // save current file position
if (obj->dev == NULL || obj->open_succ == U_FALSE || fnode == NULL) {
obj->err = UEBADF;
goto ext;
}
/* can't truncate a dir */
/* TODO: delete files under dir ? */
if (obj->type == UFFS_TYPE_DIR) {
obj->err = UEEXIST;
goto ext;
}
if (remain >= fnode->u.file.len) {
goto ext; //!< nothing to do ...
}
flen = fnode->u.file.len;
if (flen < remain) {
// file is shorter than 'reamin', fill the gap with '\0'
if (run_opt == eREAL_RUN) {
obj->pos = flen; // move file pointer to the end
if (do_WriteObject(obj, NULL, remain - flen) > 0) { // fill '\0' ...
uffs_Perror(UFFS_MSG_SERIOUS, "Write object not finished. expect %d but only %d wrote.",
remain - flen, fnode->u.file.len - flen);
obj->err = UEIOERR; // likely be an I/O error.
}
flen = obj->node->u.file.len;
}
}
else {
while (flen > remain) {
fdn = GetFdnByOfs(obj, flen - 1);
//uffs_BufFlushGroup(dev, obj->serial, fdn); //!< flush the buffer
block_start = GetStartOfDataBlock(obj, fdn);
if (remain <= block_start && fdn > 0) {
node = uffs_TreeFindDataNode(dev, obj->serial, fdn);
if (node == NULL) {
uffs_Perror(UFFS_MSG_SERIOUS,
"can't find data node when trancate obj.");
obj->err = UEIOERR;
goto ext;
}
bc = uffs_BlockInfoGet(dev, node->u.data.block);
if (bc == NULL) {
uffs_Perror(UFFS_MSG_SERIOUS,
"can't get block info when trancate obj.");
obj->err = UEIOERR;
goto ext;
}
for (page = 0; page < dev->attr->pages_per_block; page++) {
buf = uffs_BufFind(dev, fnode->u.file.serial, fdn, page);
if (buf) {
//!< ok, the buffer was loaded before ...
if (uffs_BufIsFree(buf) == U_FALSE) {
uffs_BlockInfoPut(dev, bc);
goto ext; //!< and someone is still holding the buffer,
// can't truncate it !!!
}
else if (run_opt == eREAL_RUN)
uffs_BufMarkEmpty(dev, buf); //!< discard the buffer
}
}
if (run_opt == eREAL_RUN) {
uffs_BreakFromEntry(dev, UFFS_TYPE_DATA, node);
uffs_FlashEraseBlock(dev, bc->block);
node->u.list.block = bc->block;
if (HAVE_BADBLOCK(dev))
uffs_BadBlockProcess(dev, node);
else
uffs_TreeInsertToErasedListTail(dev, node);
fnode->u.file.len = block_start;
}
flen = block_start;
uffs_BlockInfoPut(dev, bc);
}
else {
if (do_TruncateInternalWithBlockRecover(obj, fdn,
remain, run_opt) == U_SUCC) {
if (run_opt == eREAL_RUN)
fnode->u.file.len = remain;
flen = remain;
}
}
}
}
if (HAVE_BADBLOCK(dev))
uffs_BadBlockRecover(dev);
ext:
obj->pos = pos; // keep file pointer offset not changed.
uffs_Assert(fnode == obj->node, "obj->node change!\n");
return (obj->err == UENOERR ? U_SUCC : U_FAIL);
}
/** truncate obj without lock device */
static URET do_TruncateObject(uffs_Object *obj, u32 remain, UBOOL dry_run)
{
uffs_Device *dev = obj->dev;
TreeNode *fnode = obj->node;
u16 fdn;
u32 flen;
u32 block_start;
TreeNode *node;
uffs_BlockInfo *bc;
uffs_Buf *buf;
u16 page;
if (obj->dev == NULL || obj->open_succ == U_FALSE || fnode == NULL) {
obj->err = UEBADF;
goto ext;
}
/* can't truncate a dir */
/* TODO: delete files under dir ? */
if (obj->type == UFFS_TYPE_DIR) {
obj->err = UEEXIST;
goto ext;
}
if (remain >= fnode->u.file.len) {
goto ext; //!< nothing to do ...
}
flen = fnode->u.file.len;
while (flen > remain) {
fdn = GetFdnByOfs(obj, flen - 1);
//uffs_BufFlushGroup(dev, obj->serial, fdn); //!< flush the buffer
block_start = GetStartOfDataBlock(obj, fdn);
if (remain <= block_start && fdn > 0) {
node = uffs_TreeFindDataNode(dev, obj->serial, fdn);
if (node == NULL) {
uffs_Perror(UFFS_ERR_SERIOUS, "can't find data node when trancate obj.");
obj->err = UEIOERR;
goto ext;
}
bc = uffs_BlockInfoGet(dev, node->u.data.block);
if (bc == NULL) {
uffs_Perror(UFFS_ERR_SERIOUS, "can't get block info when trancate obj.");
obj->err = UEIOERR;
goto ext;
}
for (page = 0; page < dev->attr->pages_per_block; page++) {
buf = uffs_BufFind(dev, fnode->u.file.serial, fdn, page);
if (buf) { //!< ok, the buffer was loaded before ...
if (uffs_BufIsFree(buf) == U_FALSE) {
uffs_BlockInfoPut(dev, bc);
goto ext; //!< and someone is still holding the buffer, can't truncate it !!!
}
else if (dry_run == U_FALSE)
uffs_BufMarkEmpty(dev, buf); //!< discard the buffer
}
}
if (dry_run == U_FALSE) {
uffs_BlockInfoExpire(dev, bc, UFFS_ALL_PAGES);
uffs_BreakFromEntry(dev, UFFS_TYPE_DATA, node);
uffs_FlashEraseBlock(dev, bc->block);
node->u.list.block = bc->block;
if (HAVE_BADBLOCK(dev))
uffs_BadBlockProcess(dev, node);
else
uffs_TreeInsertToErasedListTail(dev, node);
uffs_BlockInfoPut(dev, bc);
fnode->u.file.len = block_start;
}
else {
uffs_BlockInfoPut(dev, bc);
}
flen = block_start;
}
else {
if (do_TruncateInternalWithBlockRecover(obj, fdn, remain, dry_run) == U_SUCC) {
if (dry_run == U_FALSE)
fnode->u.file.len = remain;
flen = remain;
}
}
}
if (HAVE_BADBLOCK(dev))
uffs_BadBlockRecover(dev);
ext:
return (obj->err == UENOERR ? U_SUCC : U_FAIL);
}
