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Dear sir.
please help me. about yaffs2 ver 1.95
I was filesystem porting about yaffs2 ver 1.95
and i did filesystem mounting and file copy , unmount .......try to re-mounting in yaffs2 filesystem.
i found wrong message. (Partially written block 2 detected)
i don't know message. you'll know it.  you'll help me.

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S/W SPEC and H/W SPEC
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1.   Kernel version 2.6.18
2.   yaffs2 filesystem version ver 1.95
3.   nand flash memory .. samsung 512Mbyte



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Job step
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1 step. eraseall  /dev/mtd3 
2 step. mount -t yaffs2 /dev/mtdblock3 /mnt/mtd3
3 step. cp test.txt /mnt/mtd3
4 step. umount  /mnt/mtd3
5 step. mount -t yaffs2 /dev/mtdblock3 /mnt/mtd3
6 step. ls /mnt/mtd3   comfirm to saving test.txt file.

After 5 step, i found wrong message. 
and when i did remounting /mnt/mtd3 in yaffs2 filesystem.
I was confirm to no file (test.txt) in /mnt/mtd3 ,befor re-mounting....did saving test.txt file in /mnt/mtd3.
but i could't found test.txt. what is problem? 




why do making wrong message? it is.. about what is problem solve method? 
you'll help me. as soon as, please....send e-mail to me about answer wrong message.

i have e-mail..... E-MAIL : wikim@ebcard.co.kr...



thank you.... have a good time...  every day.....




[Debugging message]

A. STEP 1~ 3  : erase,mounting,copy..  of  yaffs2 filesystem 
root@(none):~# eraseall /mnt/mtd3/
eraseall: /mnt/mtd3/: Is a directory
root@(none):~# eraseall /dev/mtd3 
Erasing 128 Kibyte @ 17fe0000 -- 99 % complete.
root@(none):~# mount -t yaffs2 /dev/mtdblock3 /mnt/mtd3/
do_mount(1279) dev_name=/dev/mtdblock3,dir_name=/mnt/mtd3/,type_page=yaffs2
yaffs: dev is 32505859 name is "mtdblock3"
yaffs: passed flags ""
yaffs: Attempting MTD mount on 31.3, "mtdblock3"
yaffs_read_super: isCheckpointed 0
root@(none):~#
root@(none):~# cat /proc/yaffs 
YAFFS built:Nov 18 2009 18:32:16
$Id: yaffs_fs.c,v 1.87 2009/11/11 02:11:13 charles Exp $
$Id: yaffs_guts.c,v 1.95 2009/11/11 01:40:41 charles Exp $

Device 0 "NAND Flash #1 system partition 0"
startBlock......... 0
endBlock........... 3071
totalBytesPerChunk. 2048
nDataBytesPerChunk. 2048
chunkGroupBits..... 0
chunkGroupSize..... 1
nErasedBlocks...... 3072
nReservedBlocks.... 5
blocksInCheckpoint. 0
nTnodesCreated..... 0
nFreeTnodes........ 0
nObjectsCreated.... 200
nFreeObjects....... 96
nFreeChunks........ 196608
nPageWrites........ 0
nPageReads......... 0
nBlockErasures..... 0
nGCCopies.......... 0
garbageCollections. 0
passiveGCs......... 0
nRetriedWrites..... 0
nShortOpCaches..... 10
nRetireBlocks...... 0
eccFixed........... 0
eccUnfixed......... 0
tagsEccFixed....... 0
tagsEccUnfixed..... 0
cacheHits.......... 0
nDeletedFiles...... 0
nUnlinkedFiles..... 0
nBackgroudDeletions 0
useNANDECC......... 1
noTagsECC.......... 0
isYaffs2........... 1
inbandTags......... 0
emptyLostAndFound.. 0
disableLazyLoad.... 0

root@(none):/mnt# cp test.txt /mnt/mtd3/
root@(none):/mnt# cd /mnt/mtd3/
root@(none):/mnt/mtd3# ls
lost+found  test.txt
root@(none):/mnt/mtd3# 
root@(none):/mnt/mtd3# sync 
save exit: isCheckpointed 1
save exit: isCheckpointed 1
save exit: isCheckpointed 1
root@(none):/mnt/mtd3# 
root@(none):/mnt/mtd3# cat /proc/yaffs 
YAFFS built:Nov 18 2009 18:32:16
$Id: yaffs_fs.c,v 1.87 2009/11/11 02:11:13 charles Exp $
$Id: yaffs_guts.c,v 1.95 2009/11/11 01:40:41 charles Exp $


Device 0 "NAND Flash #1 system partition 0"
startBlock......... 0
endBlock........... 3071
totalBytesPerChunk. 2048
nDataBytesPerChunk. 2048
chunkGroupBits..... 0
chunkGroupSize..... 1
nErasedBlocks...... 3070
nReservedBlocks.... 5
blocksInCheckpoint. 1
nTnodesCreated..... 100
nFreeTnodes........ 99
nObjectsCreated.... 200
nFreeObjects....... 95
nFreeChunks........ 196541
nPageWrites........ 29
nPageReads......... 3
nBlockErasures..... 0
nGCCopies.......... 0
garbageCollections. 0
passiveGCs......... 0
nRetriedWrites..... 0
nShortOpCaches..... 10
nRetireBlocks...... 0
eccFixed........... 0
eccUnfixed......... 0
tagsEccFixed....... 0
tagsEccUnfixed..... 0
cacheHits.......... 0
nDeletedFiles...... 0
nUnlinkedFiles..... 0
nBackgroudDeletions 0
useNANDECC......... 1
noTagsECC.......... 0
isYaffs2........... 1
inbandTags......... 0
emptyLostAndFound.. 0
disableLazyLoad.... 0


B. STEP 4 : unmounting of  yaffs2 filesystem 

root@(none):/mnt/mtd3# cd ..
root@(none):/mnt# umount /mnt/mtd3/
save exit: isCheckpointed 1


C. STEP 5 : mounting of  yaffs2 filesystem [ found wrond message ]

root@(none):/mnt# mount -t yaffs2 /dev/mtdblock3 /mnt/mtd3/
do_mount(1279) dev_name=/dev/mtdblock3,dir_name=/mnt/mtd3/,type_page=yaffs2
yaffs: dev is 32505859 name is "mtdblock3"
yaffs: passed flags ""
yaffs: Attempting MTD mount on 31.3, "mtdblock3"
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
Partially written block 2 detected
yaffs_read_super: isCheckpointed 0
root@(none):/mnt# 

D. STEP 6 : confirm to saving test.txt file of  yaffs2 filesystem [ I can't find it in /mnt/mtd3 what was saving test.txt file ]
                            yaffs2 file system lost test.txt. why do lost file? please ...I wish.. you tell me about problem solve answer.
                
root@(none):/mnt# cd /mnt/mtd3/
root@(none):/mnt/mtd3# ls
lost+found
root@(none):/mnt/mtd3# 

root@(none):/mnt/mtd3# cat /proc/yaffs 
YAFFS built:Nov 18 2009 18:32:16
$Id: yaffs_fs.c,v 1.87 2009/11/11 02:11:13 charles Exp $
$Id: yaffs_guts.c,v 1.95 2009/11/11 01:40:41 charles Exp $
Device 4 "NAND Flash #1 system partition 0"
startBlock......... 0
endBlock........... 3071
totalBytesPerChunk. 2048
nDataBytesPerChunk. 2048
chunkGroupBits..... 0
chunkGroupSize..... 1
nErasedBlocks...... 3071
nReservedBlocks.... 5
blocksInCheckpoint. 0
nTnodesCreated..... 0
nFreeTnodes........ 0
nObjectsCreated.... 200
nFreeObjects....... 96
nFreeChunks........ 196608
nPageWrites........ 0
nPageReads......... 0
nBlockErasures..... 0
nGCCopies.......... 0
garbageCollections. 0
passiveGCs......... 0
nRetriedWrites..... 0
nShortOpCaches..... 10
nRetireBlocks...... 0
eccFixed........... 0
eccUnfixed......... 0
tagsEccFixed....... 0
tagsEccUnfixed..... 0
cacheHits.......... 0
nDeletedFiles...... 0
nUnlinkedFiles..... 0
nBackgroudDeletions 0
useNANDECC......... 1
noTagsECC.......... 0
isYaffs2........... 1
inbandTags......... 0
emptyLostAndFound.. 0
disableLazyLoad.... 0
root@(none):/mnt/mtd3#