[Yaffs] partiall writen block... why occur?

hello... sir

why occur "Partially written block %d detected" ?


thank you...

I wish ..... as soon as .... let 's send e-mail to me.



1. yaffs filesystem version Info
const char *yaffs_guts_c_version =
"$Id: yaffs_guts.c,v 1.95 2009/11/11 01:40:41 charles Exp $";


2. occur point...

static int yaffs_ScanBackwards(yaffs_Device *dev) in yaffs_guts.c



if (foundChunksInBlock) {
/* This is a chunk that was skipped due to failing the erased check */
} else if (c == 0) {
/* We're looking at the first chunk in the block so the block is unused */
state = YAFFS_BLOCK_STATE_EMPTY;
dev->nErasedBlocks++;
} else {
if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
state == YAFFS_BLOCK_STATE_ALLOCATING) {
if (dev->sequenceNumber == bi->sequenceNumber) {
/* this is the block being allocated from */

T(YAFFS_TRACE_SCAN,
(TSTR
(" Allocating from %d %d"
TENDSTR), blk, c));

state = YAFFS_BLOCK_STATE_ALLOCATING;
dev->allocationBlock = blk;
dev->allocationPage = c;
dev->allocationBlockFinder = blk;
} else {
/* This is a partially written block that is not
* the current allocation block. This block must have
* had a write failure, so set up for retirement.
*/

/* bi->needsRetiring = 1; ??? TODO */
bi->gcPrioritise = 1;

T(YAFFS_TRACE_ALWAYS,
(TSTR("Partially written block %d detected" TENDSTR), <<--------- why occur ?
blk));
}
}
}

3. you will know the reason that "Partially written block xx detected".
what do occur the reason? and what is slove method?